1893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* pngrutil.c - utilities to read a PNG file 3893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * 4b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * Last changed in libpng 1.6.10 [March 6, 2014] 5b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * Copyright (c) 1998-2014 Glenn Randers-Pehrson 6893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 7893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 8893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * 9a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * This code is released under the libpng license. 10a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * For conditions of distribution and use, see the disclaimer 11a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * and license in png.h 12a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * 13893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * This file contains routines that are only called from within 14893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * libpng itself during the course of reading an image. 15893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project */ 16893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 17b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#include "pngpriv.h" 18893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 19b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_SUPPORTED 20893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 21b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_uint_32 PNGAPI 22b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_get_uint_31(png_const_structrp png_ptr, png_const_bytep buf) 23893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 24b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 uval = png_get_uint_32(buf); 25893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 26b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (uval > PNG_UINT_31_MAX) 27b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, "PNG unsigned integer out of range"); 28b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 29b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return (uval); 30893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 31893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 32b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_READ_cHRM_SUPPORTED) 33b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* The following is a variation on the above for use with the fixed 34b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * point values used for gAMA and cHRM. Instead of png_error it 35b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * issues a warning and returns (-1) - an invalid value because both 36b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * gAMA and cHRM use *unsigned* integers for fixed point values. 37b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 38b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FIXED_ERROR (-1) 39b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 40b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic png_fixed_point /* PRIVATE */ 41b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_get_fixed_point(png_structrp png_ptr, png_const_bytep buf) 42893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 43b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 uval = png_get_uint_32(buf); 44b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 45b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (uval <= PNG_UINT_31_MAX) 46b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return (png_fixed_point)uval; /* known to be in range */ 47b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 48b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The caller can turn off the warning by passing NULL. */ 49b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr != NULL) 50b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_warning(png_ptr, "PNG fixed point integer out of range"); 51b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 52b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return PNG_FIXED_ERROR; 53893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 54b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 55b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 56b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED 57b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* NOTE: the read macros will obscure these definitions, so that if 58b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNG_USE_READ_MACROS is set the library will not use them internally, 59b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * but the APIs will still be available externally. 60b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 61b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The parentheses around "PNGAPI function_name" in the following three 62b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * functions are necessary because they allow the macros to co-exist with 63b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * these (unused but exported) functions. 64b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 65b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 66893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* Grab an unsigned 32-bit integer from a buffer in big-endian format. */ 67b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_uint_32 (PNGAPI 68b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_get_uint_32)(png_const_bytep buf) 69893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 70b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 uval = 71b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((png_uint_32)(*(buf )) << 24) + 72b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((png_uint_32)(*(buf + 1)) << 16) + 73b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((png_uint_32)(*(buf + 2)) << 8) + 74b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((png_uint_32)(*(buf + 3)) ) ; 75893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 76b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return uval; 77893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 78893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 79893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* Grab a signed 32-bit integer from a buffer in big-endian format. The 80b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * data is stored in the PNG file in two's complement format and there 81b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is no guarantee that a 'png_int_32' is exactly 32 bits, therefore 82b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the following code does a two's complement to native conversion. 83a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott */ 84b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_int_32 (PNGAPI 85b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_get_int_32)(png_const_bytep buf) 86893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 87b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 uval = png_get_uint_32(buf); 88b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if ((uval & 0x80000000) == 0) /* non-negative */ 89b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return uval; 90893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 91b50c217251b086440efcdb273c22f86a06c80cbaChris Craik uval = (uval ^ 0xffffffff) + 1; /* 2's complement: -x = ~x+1 */ 92b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return -(png_int_32)uval; 93893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 94893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 95893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */ 96b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_uint_16 (PNGAPI 97b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_get_uint_16)(png_const_bytep buf) 98893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 99b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* ANSI-C requires an int value to accomodate at least 16 bits so this 100b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * works and allows the compiler not to worry about possible narrowing 101b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * on 32 bit systems. (Pre-ANSI systems did not make integers smaller 102b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * than 16 bits either.) 103b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 104b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int val = 105b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((unsigned int)(*buf) << 8) + 106b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((unsigned int)(*(buf + 1))); 107b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 108b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return (png_uint_16)val; 109b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 110b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 111b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNG_READ_INT_FUNCTIONS_SUPPORTED */ 112b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 113b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Read and check the PNG file signature */ 114b50c217251b086440efcdb273c22f86a06c80cbaChris Craikvoid /* PRIVATE */ 115b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_sig(png_structrp png_ptr, png_inforp info_ptr) 116b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 117b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t num_checked, num_to_check; 118b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 119b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Exit if the user application does not expect a signature. */ 120b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->sig_bytes >= 8) 121b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 122b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 123b50c217251b086440efcdb273c22f86a06c80cbaChris Craik num_checked = png_ptr->sig_bytes; 124b50c217251b086440efcdb273c22f86a06c80cbaChris Craik num_to_check = 8 - num_checked; 125b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 126b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_IO_STATE_SUPPORTED 127b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->io_state = PNG_IO_READING | PNG_IO_SIGNATURE; 128b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 129893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 130b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The signature must be serialized in a single I/O call. */ 131b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check); 132b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->sig_bytes = 8; 133b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 134b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) 135b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 136b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (num_checked < 4 && 137b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) 138b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, "Not a PNG file"); 139b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 140b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, "PNG file corrupted by ASCII conversion"); 141b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 142b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (num_checked < 3) 143b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; 144893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 145893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1464215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project/* Read the chunk header (length + type name). 1474215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project * Put the type name into png_ptr->chunk_name, and return the length. 1484215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project */ 1494215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Projectpng_uint_32 /* PRIVATE */ 150b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_chunk_header(png_structrp png_ptr) 1514215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project{ 1524215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_byte buf[8]; 1534215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_uint_32 length; 1544215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 155b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_IO_STATE_SUPPORTED 156b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_HDR; 157b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 158b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 159b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Read the length and the chunk name. 160b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * This must be performed in a single I/O call. 161b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1624215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_read_data(png_ptr, buf, 8); 1634215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project length = png_get_uint_31(png_ptr, buf); 1644215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 165b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Put the chunk name into png_ptr->chunk_name. */ 166b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(buf+4); 1674215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 168b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_debug2(0, "Reading %lx chunk, length = %lu", 169b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (unsigned long)png_ptr->chunk_name, (unsigned long)length); 1704215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 171b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Reset the crc and run it over the chunk name. */ 1724215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_reset_crc(png_ptr); 173b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_calculate_crc(png_ptr, buf + 4, 4); 1744215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 175b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Check to see if chunk name is valid. */ 1764215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_check_chunk_name(png_ptr, png_ptr->chunk_name); 1774215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 178b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_IO_STATE_SUPPORTED 179b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_DATA; 180b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 181b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1824215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project return length; 1834215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project} 1844215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 185893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* Read data, and (optionally) run it through the CRC. */ 186893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 187b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_crc_read(png_structrp png_ptr, png_bytep buf, png_uint_32 length) 188893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 189a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott if (png_ptr == NULL) 190a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott return; 191b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 192893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_read_data(png_ptr, buf, length); 193893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_calculate_crc(png_ptr, buf, length); 194893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 195893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 196893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* Optionally skip data and then check the CRC. Depending on whether we 197b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * are reading an ancillary or critical chunk, and how the program has set 198a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * things up, we may calculate the CRC on the data and print a message. 199a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * Returns '1' if there was a CRC error, '0' otherwise. 200a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott */ 201893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectint /* PRIVATE */ 202b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_crc_finish(png_structrp png_ptr, png_uint_32 skip) 203893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 204b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The size of the local buffer for inflate is a good guess as to a 205b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * reasonable size to use for buffering reads from the application. 206b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 207b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (skip > 0) 208893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 209b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 len; 210b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_byte tmpbuf[PNG_INFLATE_BUF_SIZE]; 211b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 212b50c217251b086440efcdb273c22f86a06c80cbaChris Craik len = (sizeof tmpbuf); 213b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (len > skip) 214b50c217251b086440efcdb273c22f86a06c80cbaChris Craik len = skip; 215b50c217251b086440efcdb273c22f86a06c80cbaChris Craik skip -= len; 216b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 217b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, tmpbuf, len); 218893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 219893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 220893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_error(png_ptr)) 221893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 222b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name) ? 223b50c217251b086440efcdb273c22f86a06c80cbaChris Craik !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) : 224b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)) 225893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 226893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_chunk_warning(png_ptr, "CRC error"); 227893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 228b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 229893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 230b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari png_chunk_error(png_ptr, "CRC error"); 231b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 232893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return (1); 233893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 234893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 235893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return (0); 236893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 237893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 238b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari#ifdef PNG_INDEX_SUPPORTED 239b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurariint /* PRIVATE */ 240b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripuraripng_opt_crc_finish(png_structrp png_ptr, png_uint_32 skip) 241b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari{ 242b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari while (skip > 0) 243b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari { 244b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_uint_32 len; 245b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_byte tmpbuf[PNG_INFLATE_BUF_SIZE]; 246b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari 247b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari len = (sizeof tmpbuf); 248b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari if (len > skip) 249b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari len = skip; 250b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari skip -= len; 251b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari 252b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_crc_read(png_ptr, tmpbuf, len); 253b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari } 254b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari 255b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari if (png_crc_error(png_ptr)) 256b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari { 257b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_chunk_warning(png_ptr, "CRC error"); 258b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari return (1); 259b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari } 260b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari 261b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari return (0); 262b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari} 263b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari#endif 264b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari 265893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* Compare the CRC stored in the PNG file with that calculated by libpng from 266a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * the data it has read thus far. 267a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott */ 268893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectint /* PRIVATE */ 269b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_crc_error(png_structrp png_ptr) 270893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 271893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte crc_bytes[4]; 272893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 crc; 273893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int need_crc = 1; 274893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 275b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)) 276893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 277893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == 278893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) 279893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project need_crc = 0; 280893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 281b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 282b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* critical */ 283893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 284893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) 285893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project need_crc = 0; 286893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 287893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 288b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_IO_STATE_SUPPORTED 289b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_CRC; 290b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 291b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 292b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The chunk CRC must be serialized in a single I/O call. */ 293893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_read_data(png_ptr, crc_bytes, 4); 294893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 295893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (need_crc) 296893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 297893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project crc = png_get_uint_32(crc_bytes); 298893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return ((int)(crc != png_ptr->crc)); 299893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 300b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 301893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 302893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return (0); 303893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 304893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 305b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari#if defined(PNG_READ_iCCP_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) ||\ 306b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_READ_sCAL_SUPPORTED) ||\ 307b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari defined(PNG_READ_sPLT_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) ||\ 308b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_SEQUENTIAL_READ_SUPPORTED) 309b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Manage the read buffer; this simply reallocates the buffer if it is not small 310b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * enough (or if it is not allocated). The routine returns a pointer to the 311b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * buffer; if an error occurs and 'warn' is set the routine returns NULL, else 312b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * it will call png_error (via png_malloc) on failure. (warn == 2 means 313b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 'silent'). 314b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 315b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic png_bytep 316b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_buffer(png_structrp png_ptr, png_alloc_size_t new_size, int warn) 317893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 318b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer = png_ptr->read_buffer; 319b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 320b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buffer != NULL && new_size > png_ptr->read_buffer_size) 321b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 322b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer = NULL; 323b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer = NULL; 324b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer_size = 0; 325b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_free(png_ptr, buffer); 326b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = NULL; 327b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 328b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 329b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buffer == NULL) 330b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 331b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = png_voidcast(png_bytep, png_malloc_base(png_ptr, new_size)); 332b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 333b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buffer != NULL) 334b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 335b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer = buffer; 336b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer_size = new_size; 337b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 338b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 339b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (warn < 2) /* else silent */ 340b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 341b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (warn) 342b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_warning(png_ptr, "insufficient memory to read chunk"); 343b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari 344b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 345b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "insufficient memory to read chunk"); 346b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 347b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3485f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 349b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return buffer; 350b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 351b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari#endif /* PNG_READ_iCCP|iTXt|pCAL|sCAL|sPLT|tEXt|zTXt|SEQUENTIAL_READ */ 352893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 353b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* png_inflate_claim: claim the zstream for some nefarious purpose that involves 354b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * decompression. Returns Z_OK on success, else a zlib error code. It checks 355b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the owner but, in final release builds, just issues a warning if some other 356b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * chunk apparently owns the stream. Prior to release it does a png_error. 357b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 358b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic int 359b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_inflate_claim(png_structrp png_ptr, png_uint_32 owner) 360b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 361b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->zowner != 0) 362893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 363b50c217251b086440efcdb273c22f86a06c80cbaChris Craik char msg[64]; 3645f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 365b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_STRING_FROM_CHUNK(msg, png_ptr->zowner); 366b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* So the message that results is "<chunk> using zstream"; this is an 367b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * internal error, but is very useful for debugging. i18n requirements 368b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * are minimal. 3695f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott */ 370b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (void)png_safecat(msg, (sizeof msg), 4, " using zstream"); 371b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC 372b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_warning(png_ptr, msg); 373b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zowner = 0; 374b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 375b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, msg); 376b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 377b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 378b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 379b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Implementation note: unlike 'png_deflate_claim' this internal function 380b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * does not take the size of the data as an argument. Some efficiency could 381b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * be gained by using this when it is known *if* the zlib stream itself does 382b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * not record the number; however, this is an illusion: the original writer 383b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * of the PNG may have selected a lower window size, and we really must 384b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * follow that because, for systems with with limited capabilities, we 385b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * would otherwise reject the application's attempts to use a smaller window 386b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * size (zlib doesn't have an interface to say "this or lower"!). 387b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 388b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * inflateReset2 was added to zlib 1.2.4; before this the window could not be 389b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * reset, therefore it is necessary to always allocate the maximum window 390b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * size with earlier zlibs just in case later compressed chunks need it. 391b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 392b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 393b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int ret; /* zlib return code */ 394b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if PNG_ZLIB_VERNUM >= 0x1240 395893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 396b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if defined(PNG_SET_OPTION_SUPPORTED) && \ 397b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_MAXIMUM_INFLATE_WINDOW) 398b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int window_bits; 399893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 400b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (((png_ptr->options >> PNG_MAXIMUM_INFLATE_WINDOW) & 3) == 401b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_OPTION_ON) 402b50c217251b086440efcdb273c22f86a06c80cbaChris Craik window_bits = 15; 403b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 404b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 405b50c217251b086440efcdb273c22f86a06c80cbaChris Craik window_bits = 0; 406b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 407b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define window_bits 0 408b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 409b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 410b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 411b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Set this for safety, just in case the previous owner left pointers to 412b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * memory allocations. 4135f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott */ 414b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_in = NULL; 415b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_in = 0; 416b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_out = NULL; 417b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_out = 0; 418b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 419b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) 420893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 421b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if PNG_ZLIB_VERNUM < 0x1240 422b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = inflateReset(&png_ptr->zstream); 423b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 424b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = inflateReset2(&png_ptr->zstream, window_bits); 425b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 426b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 427b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 428b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 429b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 430b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if PNG_ZLIB_VERNUM < 0x1240 431b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = inflateInit(&png_ptr->zstream); 432b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 433b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = inflateInit2(&png_ptr->zstream, window_bits); 434b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 435b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 436b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (ret == Z_OK) 437b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED; 4385f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 439893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4405f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (ret == Z_OK) 441b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zowner = owner; 442b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 443b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 444b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_zstream_error(png_ptr, ret); 445b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 446b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return ret; 447b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 448b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 449b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef window_bits 450b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# undef window_bits 451b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 452b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 453893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 454b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED 455b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* png_inflate now returns zlib error codes including Z_OK and Z_STREAM_END to 456b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * allow the caller to do multiple calls if required. If the 'finish' flag is 457b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * set Z_FINISH will be passed to the final inflate() call and Z_STREAM_END must 458b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * be returned or there has been a problem, otherwise Z_SYNC_FLUSH is used and 459b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Z_OK or Z_STREAM_END will be returned on success. 460b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 461b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The input and output sizes are updated to the actual amounts of data consumed 462b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * or written, not the amount available (as in a z_stream). The data pointers 463b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * are not changed, so the next input is (data+input_size) and the next 464b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * available output is (output+output_size). 465b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 466b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic int 467b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_inflate(png_structrp png_ptr, png_uint_32 owner, int finish, 468b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* INPUT: */ png_const_bytep input, png_uint_32p input_size_ptr, 469b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* OUTPUT: */ png_bytep output, png_alloc_size_t *output_size_ptr) 470b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 471b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->zowner == owner) /* Else not claimed */ 472b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 473b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int ret; 474b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t avail_out = *output_size_ptr; 475b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 avail_in = *input_size_ptr; 476b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 477b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* zlib can't necessarily handle more than 65535 bytes at once (i.e. it 478b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * can't even necessarily handle 65536 bytes) because the type uInt is 479b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * "16 bits or more". Consequently it is necessary to chunk the input to 480b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * zlib. This code uses ZLIB_IO_MAX, from pngpriv.h, as the maximum (the 481b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * maximum value that can be stored in a uInt.) It is possible to set 482b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * ZLIB_IO_MAX to a lower value in pngpriv.h and this may sometimes have 483b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * a performance advantage, because it reduces the amount of data accessed 484b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * at each step and that may give the OS more time to page it in. 4855f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott */ 486b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input); 487b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* avail_in and avail_out are set below from 'size' */ 4885f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_ptr->zstream.avail_in = 0; 489b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_out = 0; 4905f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 491b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Read directly into the output if it is available (this is set to 492b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * a local buffer below if output is NULL). 4935f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott */ 494b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (output != NULL) 495b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_out = output; 496b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 497b50c217251b086440efcdb273c22f86a06c80cbaChris Craik do 4985f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 499b50c217251b086440efcdb273c22f86a06c80cbaChris Craik uInt avail; 500b50c217251b086440efcdb273c22f86a06c80cbaChris Craik Byte local_buffer[PNG_INFLATE_BUF_SIZE]; 501893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 502b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* zlib INPUT BUFFER */ 503b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The setting of 'avail_in' used to be outside the loop; by setting it 504b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * inside it is possible to chunk the input to zlib and simply rely on 505b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * zlib to advance the 'next_in' pointer. This allows arbitrary 506b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * amounts of data to be passed through zlib at the unavoidable cost of 507b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * requiring a window save (memcpy of up to 32768 output bytes) 508b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * every ZLIB_IO_MAX input bytes. 509b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 510b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_in += png_ptr->zstream.avail_in; /* not consumed last time */ 5115f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 512b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail = ZLIB_IO_MAX; 513b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 514b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (avail_in < avail) 515b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail = (uInt)avail_in; /* safe: < than ZLIB_IO_MAX */ 516b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 517b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_in -= avail; 518b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_in = avail; 519b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 520b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* zlib OUTPUT BUFFER */ 521b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_out += png_ptr->zstream.avail_out; /* not written last time */ 522b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 523b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail = ZLIB_IO_MAX; /* maximum zlib can process */ 524b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 525b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (output == NULL) 526b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 527b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Reset the output buffer each time round if output is NULL and 528b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * make available the full buffer, up to 'remaining_space' 529b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 530b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_out = local_buffer; 531b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if ((sizeof local_buffer) < avail) 532b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail = (sizeof local_buffer); 533893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 5345f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 535b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (avail_out < avail) 536b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail = (uInt)avail_out; /* safe: < ZLIB_IO_MAX */ 537893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 538b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_out = avail; 539b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_out -= avail; 540b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 541b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* zlib inflate call */ 542b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* In fact 'avail_out' may be 0 at this point, that happens at the end 543b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * of the read when the final LZ end code was not passed at the end of 544b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the previous chunk of input data. Tell zlib if we have reached the 545b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * end of the output buffer. 546b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 547b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = inflate(&png_ptr->zstream, avail_out > 0 ? Z_NO_FLUSH : 548b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (finish ? Z_FINISH : Z_SYNC_FLUSH)); 549b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } while (ret == Z_OK); 550b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 551b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* For safety kill the local buffer pointer now */ 552b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (output == NULL) 553b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_out = NULL; 554b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 555b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Claw back the 'size' and 'remaining_space' byte counts. */ 556b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_in += png_ptr->zstream.avail_in; 557b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_out += png_ptr->zstream.avail_out; 558b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 559b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Update the input and output sizes; the updated values are the amount 560b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * consumed or written, effectively the inverse of what zlib uses. 5615f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott */ 562b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (avail_out > 0) 563b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *output_size_ptr -= avail_out; 564b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 565b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (avail_in > 0) 566b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *input_size_ptr -= avail_in; 567b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 568b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Ensure png_ptr->zstream.msg is set (even in the success case!) */ 569b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_zstream_error(png_ptr, ret); 570b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return ret; 571b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 572b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 573b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 574b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 575b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is a bad internal error. The recovery assigns to the zstream msg 576b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * pointer, which is not owned by the caller, but this is safe; it's only 577b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * used on errors! 578b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 579b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.msg = PNGZ_MSG_CAST("zstream unclaimed"); 580b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return Z_STREAM_ERROR; 5815f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 5825f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott} 583a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott 5845f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott/* 585b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Decompress trailing data in a chunk. The assumption is that read_buffer 5865f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott * points at an allocated area holding the contents of a chunk with a 5875f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott * trailing compressed part. What we get back is an allocated area 5885f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott * holding the original prefix part and an uncompressed version of the 5895f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott * trailing part (the malloc area passed in is freed). 5905f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott */ 591b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic int 592b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_decompress_chunk(png_structrp png_ptr, 593b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 chunklength, png_uint_32 prefix_size, 594b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t *newlength /* must be initialized to the maximum! */, 595b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int terminate /*add a '\0' to the end of the uncompressed data*/) 5965f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott{ 597b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* TODO: implement different limits for different types of chunk. 598b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 599b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The caller supplies *newlength set to the maximum length of the 600b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * uncompressed data, but this routine allocates space for the prefix and 601b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * maybe a '\0' terminator too. We have to assume that 'prefix_size' is 602b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * limited only by the maximum chunk size. 603b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 604b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t limit = PNG_SIZE_MAX; 605b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 606b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED 607b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->user_chunk_malloc_max > 0 && 608b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->user_chunk_malloc_max < limit) 609b50c217251b086440efcdb273c22f86a06c80cbaChris Craik limit = png_ptr->user_chunk_malloc_max; 610b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# elif PNG_USER_CHUNK_MALLOC_MAX > 0 611b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (PNG_USER_CHUNK_MALLOC_MAX < limit) 612b50c217251b086440efcdb273c22f86a06c80cbaChris Craik limit = PNG_USER_CHUNK_MALLOC_MAX; 613b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 614a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott 615b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (limit >= prefix_size + (terminate != 0)) 6165f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 617b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int ret; 618a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott 619b50c217251b086440efcdb273c22f86a06c80cbaChris Craik limit -= prefix_size + (terminate != 0); 6205f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 621b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (limit < *newlength) 622b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *newlength = limit; 623b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 624b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Now try to claim the stream. */ 625b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = png_inflate_claim(png_ptr, png_ptr->chunk_name); 626b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 627b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (ret == Z_OK) 6285f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 629b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 lzsize = chunklength - prefix_size; 630ccee121fae4c60a5dee6fce51195185694c376c3Dave Burke 631b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = png_inflate(png_ptr, png_ptr->chunk_name, 1/*finish*/, 632b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* input: */ png_ptr->read_buffer + prefix_size, &lzsize, 633b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* output: */ NULL, newlength); 6345f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 635b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (ret == Z_STREAM_END) 636893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 637b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Use 'inflateReset' here, not 'inflateReset2' because this 638b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * preserves the previously decided window size (otherwise it would 639b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * be necessary to store the previous window size.) In practice 640b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this doesn't matter anyway, because png_inflate will call inflate 641b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * with Z_FINISH in almost all cases, so the window will not be 642b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * maintained. 643b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 644b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (inflateReset(&png_ptr->zstream) == Z_OK) 6455f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 646b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Because of the limit checks above we know that the new, 647b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * expanded, size will fit in a size_t (let alone an 648b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * png_alloc_size_t). Use png_malloc_base here to avoid an 649b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * extra OOM message. 650b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 651b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t new_size = *newlength; 652b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t buffer_size = prefix_size + new_size + 653b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (terminate != 0); 654b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep text = png_voidcast(png_bytep, png_malloc_base(png_ptr, 655b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer_size)); 656b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 657b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (text != NULL) 658b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 659b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = png_inflate(png_ptr, png_ptr->chunk_name, 1/*finish*/, 660b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer + prefix_size, &lzsize, 661b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text + prefix_size, newlength); 662b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 663b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (ret == Z_STREAM_END) 664b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 665b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (new_size == *newlength) 666b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 667b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (terminate) 668b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text[prefix_size + *newlength] = 0; 669b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 670b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (prefix_size > 0) 671b50c217251b086440efcdb273c22f86a06c80cbaChris Craik memcpy(text, png_ptr->read_buffer, prefix_size); 672b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 673b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 674b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep old_ptr = png_ptr->read_buffer; 675b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 676b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer = text; 677b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer_size = buffer_size; 678b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text = old_ptr; /* freed below */ 679b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 680b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 681b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 682b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 683b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 684b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The size changed on the second read, there can be no 685b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * guarantee that anything is correct at this point. 686b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The 'msg' pointer has been set to "unexpected end of 687b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * LZ stream", which is fine, but return an error code 688b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * that the caller won't accept. 689b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 690b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = PNG_UNEXPECTED_ZLIB_RETURN; 691b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 692b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 693b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 694b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (ret == Z_OK) 695b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = PNG_UNEXPECTED_ZLIB_RETURN; /* for safety */ 696b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 697b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Free the text pointer (this is the old read_buffer on 698b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * success) 699b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 700b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_free(png_ptr, text); 701b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 702b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This really is very benign, but it's still an error because 703b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the extra space may otherwise be used as a Trojan Horse. 704b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 705b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (ret == Z_STREAM_END && 706b50c217251b086440efcdb273c22f86a06c80cbaChris Craik chunklength - prefix_size != lzsize) 707b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "extra compressed data"); 708b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 709b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 710b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 711b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 712b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Out of memory allocating the buffer */ 713b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = Z_MEM_ERROR; 714b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_zstream_error(png_ptr, Z_MEM_ERROR); 715b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 7165f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 717893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 718b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 719b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 720b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* inflateReset failed, store the error message */ 721b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_zstream_error(png_ptr, ret); 722b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 723b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (ret == Z_STREAM_END) 724b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = PNG_UNEXPECTED_ZLIB_RETURN; 725b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 7265f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 727b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 728b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (ret == Z_OK) 729b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = PNG_UNEXPECTED_ZLIB_RETURN; 730b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 731b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Release the claimed stream */ 732b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zowner = 0; 7335f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 7345f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 735b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* the claim failed */ if (ret == Z_STREAM_END) /* impossible! */ 736b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = PNG_UNEXPECTED_ZLIB_RETURN; 737893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 738b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return ret; 739b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 740893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 741b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 742b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 743b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Application/configuration limits exceeded */ 744b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_zstream_error(png_ptr, Z_MEM_ERROR); 745b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return Z_MEM_ERROR; 746893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 747b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 748b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNG_READ_COMPRESSED_TEXT_SUPPORTED */ 7495f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 750b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_iCCP_SUPPORTED 751b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Perform a partial read and decompress, producing 'avail_out' bytes and 752b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * reading from the current chunk as required. 753b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 754b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic int 755b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_inflate_read(png_structrp png_ptr, png_bytep read_buffer, uInt read_size, 756b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32p chunk_bytes, png_bytep next_out, png_alloc_size_t *out_size, 757b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int finish) 758b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 759b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->zowner == png_ptr->chunk_name) 7605f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 761b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int ret; 762b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 763b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* next_in and avail_in must have been initialized by the caller. */ 764b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_out = next_out; 765b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_out = 0; /* set in the loop */ 766b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 767b50c217251b086440efcdb273c22f86a06c80cbaChris Craik do 7685f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 769b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->zstream.avail_in == 0) 770b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 771b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (read_size > *chunk_bytes) 772b50c217251b086440efcdb273c22f86a06c80cbaChris Craik read_size = (uInt)*chunk_bytes; 773b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *chunk_bytes -= read_size; 774b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 775b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (read_size > 0) 776b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, read_buffer, read_size); 777b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 778b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_in = read_buffer; 779b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_in = read_size; 780b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 781b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 782b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->zstream.avail_out == 0) 783b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 784b50c217251b086440efcdb273c22f86a06c80cbaChris Craik uInt avail = ZLIB_IO_MAX; 785b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (avail > *out_size) 786b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail = (uInt)*out_size; 787b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *out_size -= avail; 788b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 789b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_out = avail; 790b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 7915f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 792b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Use Z_SYNC_FLUSH when there is no more chunk data to ensure that all 793b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the available output is produced; this allows reading of truncated 794b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * streams. 795b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 796b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = inflate(&png_ptr->zstream, 797b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *chunk_bytes > 0 ? Z_NO_FLUSH : (finish ? Z_FINISH : Z_SYNC_FLUSH)); 7985f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 799b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (ret == Z_OK && (*out_size > 0 || png_ptr->zstream.avail_out > 0)); 800b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 801b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *out_size += png_ptr->zstream.avail_out; 802b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_out = 0; /* Should not be required, but is safe */ 803b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 804b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Ensure the error message pointer is always set: */ 805b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_zstream_error(png_ptr, ret); 806b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return ret; 8075f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 8085f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 809b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 810b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 811b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.msg = PNGZ_MSG_CAST("zstream unclaimed"); 812b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return Z_STREAM_ERROR; 813b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 814893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 815893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 816893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 817a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott/* Read and check the IDHR chunk */ 818893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 819b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_IHDR(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 820893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 821893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[13]; 822893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 width, height; 823893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int bit_depth, color_type, compression_type, filter_type; 824893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int interlace_type; 825893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 8264215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_IHDR"); 827893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 828893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->mode & PNG_HAVE_IHDR) 829b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "out of place"); 830893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 831a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Check the length */ 832893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != 13) 833b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "invalid"); 834893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 835893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->mode |= PNG_HAVE_IHDR; 836893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 837893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, 13); 838893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, 0); 839893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 840893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project width = png_get_uint_31(png_ptr, buf); 841893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project height = png_get_uint_31(png_ptr, buf + 4); 842893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project bit_depth = buf[8]; 843893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project color_type = buf[9]; 844893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project compression_type = buf[10]; 845893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project filter_type = buf[11]; 846893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project interlace_type = buf[12]; 847893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 848a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Set internal variables */ 849893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->width = width; 850893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->height = height; 851893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->bit_depth = (png_byte)bit_depth; 852893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->interlaced = (png_byte)interlace_type; 853893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->color_type = (png_byte)color_type; 8545f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_MNG_FEATURES_SUPPORTED 855893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->filter_type = (png_byte)filter_type; 856893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 857893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->compression_type = (png_byte)compression_type; 858893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 859a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Find number of channels */ 860893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project switch (png_ptr->color_type) 861893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 862b50c217251b086440efcdb273c22f86a06c80cbaChris Craik default: /* invalid, png_set_IHDR calls png_error */ 863893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case PNG_COLOR_TYPE_GRAY: 864893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case PNG_COLOR_TYPE_PALETTE: 865893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->channels = 1; 866893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 867a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott 868893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case PNG_COLOR_TYPE_RGB: 869893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->channels = 3; 870893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 871a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott 872893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case PNG_COLOR_TYPE_GRAY_ALPHA: 873893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->channels = 2; 874893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 875a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott 876893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case PNG_COLOR_TYPE_RGB_ALPHA: 877893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->channels = 4; 878893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 879893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 880893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 881a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Set up other useful info */ 882893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth * 883893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->channels); 8844215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width); 8854215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug1(3, "bit_depth = %d", png_ptr->bit_depth); 8864215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug1(3, "channels = %d", png_ptr->channels); 887b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_debug1(3, "rowbytes = %lu", (unsigned long)png_ptr->rowbytes); 888893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, 889b50c217251b086440efcdb273c22f86a06c80cbaChris Craik color_type, interlace_type, compression_type, filter_type); 890893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 891893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 892a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott/* Read and check the palette */ 893893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 894b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 895893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 896893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_color palette[PNG_MAX_PALETTE_LENGTH]; 897893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int num, i; 8985f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_POINTER_INDEXING_SUPPORTED 899893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_colorp pal_ptr; 900893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 901893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 9024215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_PLTE"); 903893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 904893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 905b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 906b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 907b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Moved to before the 'after IDAT' check below because otherwise duplicate 908b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PLTE chunks are potentially ignored (the spec says there shall not be more 909b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * than one PLTE, the error is not treated as benign, so this check trumps 910b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the requirement that PLTE appears before IDAT.) 911b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 912b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (png_ptr->mode & PNG_HAVE_PLTE) 913b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "duplicate"); 914a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott 915893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->mode & PNG_HAVE_IDAT) 916893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 917b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is benign because the non-benign error happened before, when an 918b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * IDAT was encountered in a color-mapped image with no PLTE. 919b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 920893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 921b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 922893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 923893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 924a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott 925893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->mode |= PNG_HAVE_PLTE; 926893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 927b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) 928893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 929893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 930b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "ignored in grayscale PNG"); 931893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 932893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 933b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 9345f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifndef PNG_READ_OPT_PLTE_SUPPORTED 935893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) 936893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 937893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 938893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 939893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 940893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 941893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 942893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3) 943893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 944b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 945b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 946893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) 947b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 948a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott 949893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 950b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "invalid"); 951b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 952b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 953893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 954893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 955b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The cast is safe because 'length' is less than 3*PNG_MAX_PALETTE_LENGTH */ 956893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project num = (int)length / 3; 957893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 9585f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_POINTER_INDEXING_SUPPORTED 959893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++) 960893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 961893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[3]; 962893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 963893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, 3); 964893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project pal_ptr->red = buf[0]; 965893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project pal_ptr->green = buf[1]; 966893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project pal_ptr->blue = buf[2]; 967893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 968893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#else 969893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0; i < num; i++) 970893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 971893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[3]; 972893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 973893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, 3); 974a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Don't depend upon png_color being any order */ 975893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project palette[i].red = buf[0]; 976893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project palette[i].green = buf[1]; 977893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project palette[i].blue = buf[2]; 978893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 979893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 980893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 981b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* If we actually need the PLTE chunk (ie for a paletted image), we do 982a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * whatever the normal CRC configuration tells us. However, if we 983a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * have an RGB image, the PLTE can be considered ancillary, so 984a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * we will act as though it is. 985a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott */ 9865f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifndef PNG_READ_OPT_PLTE_SUPPORTED 987893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 988893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 989893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 990893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, 0); 991893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 992b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 9935f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifndef PNG_READ_OPT_PLTE_SUPPORTED 994893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */ 995893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 996893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* If we don't want to use the data from an ancillary chunk, 997b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * we have two options: an error abort, or a warning and we 998b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * ignore the data in this chunk (which should be OK, since 999b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * it's considered ancillary for a RGB or RGBA image). 1000b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1001b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * IMPLEMENTATION NOTE: this is only here because png_crc_finish uses the 1002b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * chunk type to determine whether to check the ancillary or the critical 1003b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * flags. 1004b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1005893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE)) 1006893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1007893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) 1008b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari return; 1009b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1010893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 1011b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari png_chunk_error(png_ptr, "CRC error"); 1012893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1013b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1014893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* Otherwise, we (optionally) emit a warning and use the chunk. */ 1015893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) 1016893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_chunk_warning(png_ptr, "CRC error"); 1017893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1018893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 1019893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1020b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* TODO: png_set_PLTE has the side effect of setting png_ptr->palette to its 1021b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * own copy of the palette. This has the side effect that when png_start_row 1022b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is called (this happens after any call to png_read_update_info) the 1023b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * info_ptr palette gets changed. This is extremely unexpected and 1024b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * confusing. 1025b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1026b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Fix this by not sharing the palette in this way. 1027b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1028893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_PLTE(png_ptr, info_ptr, palette, num); 1029893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1030b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The three chunks, bKGD, hIST and tRNS *must* appear after PLTE and before 1031b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * IDAT. Prior to 1.6.0 this was not checked; instead the code merely 1032b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * checked the apparent validity of a tRNS chunk inserted before PLTE on a 1033b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * palette PNG. 1.6.0 attempts to rigorously follow the standard and 1034b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * therefore does a benign error if the erroneous condition is detected *and* 1035b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * cancels the tRNS if the benign error returns. The alternative is to 1036b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * amend the standard since it would be rather hypocritical of the standards 1037b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * maintainers to ignore it. 1038b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 10395f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_tRNS_SUPPORTED 1040b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->num_trans > 0 || 1041b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS) != 0)) 1042893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1043b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Cancel this because otherwise it would be used if the transforms 1044b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * require it. Don't cancel the 'valid' flag because this would prevent 1045b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * detection of duplicate chunks. 1046b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1047b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->num_trans = 0; 1048b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1049b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (info_ptr != NULL) 1050b50c217251b086440efcdb273c22f86a06c80cbaChris Craik info_ptr->num_trans = 0; 1051b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1052b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "tRNS must be after"); 1053893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1054893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 1055893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1056b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_hIST_SUPPORTED 1057b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) != 0) 1058b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "hIST must be after"); 1059b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1060b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1061b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_bKGD_SUPPORTED 1062b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) != 0) 1063b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "bKGD must be after"); 1064b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1065893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 1066893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1067893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 1068b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_IEND(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 1069893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 10704215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_IEND"); 1071893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1072893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT)) 1073b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "out of place"); 1074893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1075893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND); 1076893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1077893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1078893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1079b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (length != 0) 1080b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 1081b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1082b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_UNUSED(info_ptr) 1083893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 1084893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 10855f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_gAMA_SUPPORTED 1086893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 1087b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_gAMA(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 1088893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 1089893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_fixed_point igamma; 1090893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[4]; 1091893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 10924215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_gAMA"); 1093893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1094893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 1095b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 1096893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1097b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) 1098893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1099893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1100b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 1101893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1102893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1103893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1104893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != 4) 1105893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1106893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1107b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 1108893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1109893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1110893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1111893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, 4); 1112b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1113893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 1114893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1115893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1116b50c217251b086440efcdb273c22f86a06c80cbaChris Craik igamma = png_get_fixed_point(NULL, buf); 1117893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1118b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspace_set_gamma(png_ptr, &png_ptr->colorspace, igamma); 1119b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspace_sync(png_ptr, info_ptr); 1120893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 1121893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 1122893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 11235f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_sBIT_SUPPORTED 1124893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 1125b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_sBIT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 1126893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 1127b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari unsigned int truelen, i; 1128b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari png_byte sample_depth; 1129893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[4]; 1130893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 11314215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_sBIT"); 1132893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1133893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 1134b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 1135b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1136b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) 1137893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1138893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1139b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 1140893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1141893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1142b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1143893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)) 1144893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1145893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1146b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "duplicate"); 1147893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1148893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1149893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1150893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 1151b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari { 1152893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project truelen = 3; 1153b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari sample_depth = 8; 1154b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari } 1155b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1156893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 1157b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari { 1158b50c217251b086440efcdb273c22f86a06c80cbaChris Craik truelen = png_ptr->channels; 1159b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari sample_depth = png_ptr->bit_depth; 1160b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari } 1161893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1162893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != truelen || length > 4) 1163893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1164b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 1165893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1166893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1167893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1168893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1169b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari buf[0] = buf[1] = buf[2] = buf[3] = sample_depth; 1170893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, truelen); 1171b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1172893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 1173893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1174893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1175b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari for (i=0; i<truelen; ++i) 1176b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari if (buf[i] == 0 || buf[i] > sample_depth) 1177b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari { 1178b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari png_chunk_benign_error(png_ptr, "invalid"); 1179b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari return; 1180b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari } 1181b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari 1182893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) 1183893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1184893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->sig_bit.red = buf[0]; 1185893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->sig_bit.green = buf[1]; 1186893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->sig_bit.blue = buf[2]; 1187893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->sig_bit.alpha = buf[3]; 1188893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1189b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1190893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 1191893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1192893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->sig_bit.gray = buf[0]; 1193893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->sig_bit.red = buf[0]; 1194893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->sig_bit.green = buf[0]; 1195893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->sig_bit.blue = buf[0]; 1196893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->sig_bit.alpha = buf[1]; 1197893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1198b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1199893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit)); 1200893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 1201893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 1202893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 12035f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_cHRM_SUPPORTED 1204893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 1205b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_cHRM(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 1206893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 12074215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_byte buf[32]; 1208b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_xy xy; 1209893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 12104215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_cHRM"); 1211893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1212893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 1213b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 1214893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1215b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) 1216893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1217893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1218b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 1219893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1220893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1221893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1222893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != 32) 1223893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1224893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1225b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 1226893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1227893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1228893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 12294215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_crc_read(png_ptr, buf, 32); 1230b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 12314215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project if (png_crc_finish(png_ptr, 0)) 1232893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1233893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1234b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.whitex = png_get_fixed_point(NULL, buf); 1235b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.whitey = png_get_fixed_point(NULL, buf + 4); 1236b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.redx = png_get_fixed_point(NULL, buf + 8); 1237b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.redy = png_get_fixed_point(NULL, buf + 12); 1238b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.greenx = png_get_fixed_point(NULL, buf + 16); 1239b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.greeny = png_get_fixed_point(NULL, buf + 20); 1240b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.bluex = png_get_fixed_point(NULL, buf + 24); 1241b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.bluey = png_get_fixed_point(NULL, buf + 28); 1242b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1243b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (xy.whitex == PNG_FIXED_ERROR || 1244b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.whitey == PNG_FIXED_ERROR || 1245b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.redx == PNG_FIXED_ERROR || 1246b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.redy == PNG_FIXED_ERROR || 1247b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.greenx == PNG_FIXED_ERROR || 1248b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.greeny == PNG_FIXED_ERROR || 1249b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.bluex == PNG_FIXED_ERROR || 1250b50c217251b086440efcdb273c22f86a06c80cbaChris Craik xy.bluey == PNG_FIXED_ERROR) 1251b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1252b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid values"); 1253b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 1254b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1255893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1256b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* If a colorspace error has already been output skip this chunk */ 1257b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) 1258b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 1259893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1260b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) 1261b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1262b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID; 1263b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspace_sync(png_ptr, info_ptr); 1264b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "duplicate"); 1265b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 1266b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1267b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1268b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; 1269b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (void)png_colorspace_set_chromaticities(png_ptr, &png_ptr->colorspace, &xy, 1270b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1/*prefer cHRM values*/); 1271b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspace_sync(png_ptr, info_ptr); 1272893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 1273893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 1274893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 12755f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_sRGB_SUPPORTED 1276893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 1277b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_sRGB(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 1278893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 1279b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_byte intent; 1280893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 12814215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_sRGB"); 1282893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1283893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 1284b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 1285893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1286b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) 1287893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1288893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1289b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 1290893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1291893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1292893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1293893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != 1) 1294893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1295893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1296b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 1297893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1298893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1299893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1300b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, &intent, 1); 1301b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1302893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 1303893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1304893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1305b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* If a colorspace error has already been output skip this chunk */ 1306b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) 1307893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1308893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1309b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Only one sRGB or iCCP chunk is allowed, use the HAVE_INTENT flag to detect 1310b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this. 1311b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1312b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) 1313893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1314b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID; 1315b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspace_sync(png_ptr, info_ptr); 1316b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "too many profiles"); 1317b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 1318893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1319893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1320b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (void)png_colorspace_set_sRGB(png_ptr, &png_ptr->colorspace, intent); 1321b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspace_sync(png_ptr, info_ptr); 1322893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 1323893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif /* PNG_READ_sRGB_SUPPORTED */ 1324893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 13255f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_iCCP_SUPPORTED 1326893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 1327b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 1328b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Note: this does not properly handle profiles that are > 64K under DOS */ 1329893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 1330b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp errmsg = NULL; /* error message output, or no error */ 1331b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int finished = 0; /* crc checked */ 1332893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 13334215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_iCCP"); 1334893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1335893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 1336b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 1337b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1338b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) 1339893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1340893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1341b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 1342893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1343893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1344893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1345b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Consistent with all the above colorspace handling an obviously *invalid* 1346b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * chunk is just ignored, so does not invalidate the color space. An 1347b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * alternative is to set the 'invalid' flags at the start of this routine 1348b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * and only clear them in they were not set before and all the tests pass. 1349b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The minimum 'deflate' stream is assumed to be just the 2 byte header and 4 1350b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * byte checksum. The keyword must be one character and there is a 1351b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * terminator (0) byte and the compression method. 1352b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1353b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (length < 9) 1354893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1355893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1356b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "too short"); 1357893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1358893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1359893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1360b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* If a colorspace error has already been output skip this chunk */ 1361b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) 1362893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1363b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 1364b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 1365893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1366893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1367b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Only one sRGB or iCCP chunk is allowed, use the HAVE_INTENT flag to detect 1368b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this. 1369b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1370b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) == 0) 1371893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1372b50c217251b086440efcdb273c22f86a06c80cbaChris Craik uInt read_length, keyword_length; 1373b50c217251b086440efcdb273c22f86a06c80cbaChris Craik char keyword[81]; 1374893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1375b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Find the keyword; the keyword plus separator and compression method 1376b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * bytes can be at most 81 characters long. 1377b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1378b50c217251b086440efcdb273c22f86a06c80cbaChris Craik read_length = 81; /* maximum */ 1379b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (read_length > length) 1380b50c217251b086440efcdb273c22f86a06c80cbaChris Craik read_length = (uInt)length; 1381893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1382b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, (png_bytep)keyword, read_length); 1383b50c217251b086440efcdb273c22f86a06c80cbaChris Craik length -= read_length; 1384893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1385b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keyword_length = 0; 1386b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (keyword_length < 80 && keyword_length < read_length && 1387b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keyword[keyword_length] != 0) 1388b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ++keyword_length; 1389893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1390b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* TODO: make the keyword checking common */ 1391b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (keyword_length >= 1 && keyword_length <= 79) 1392b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1393b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* We only understand '0' compression - deflate - so if we get a 1394b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * different value we can't safely decode the chunk. 1395b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1396b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (keyword_length+1 < read_length && 1397b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keyword[keyword_length+1] == PNG_COMPRESSION_TYPE_BASE) 1398b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1399b50c217251b086440efcdb273c22f86a06c80cbaChris Craik read_length -= keyword_length+2; 1400893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1401b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_inflate_claim(png_ptr, png_iCCP) == Z_OK) 1402b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1403b50c217251b086440efcdb273c22f86a06c80cbaChris Craik Byte profile_header[132]; 1404b50c217251b086440efcdb273c22f86a06c80cbaChris Craik Byte local_buffer[PNG_INFLATE_BUF_SIZE]; 1405b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t size = (sizeof profile_header); 1406893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1407b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_in = (Bytef*)keyword + (keyword_length+2); 1408b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_in = read_length; 1409b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (void)png_inflate_read(png_ptr, local_buffer, 1410b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (sizeof local_buffer), &length, profile_header, &size, 1411b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 0/*finish: don't, because the output is too small*/); 1412893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1413b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (size == 0) 1414b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1415b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* We have the ICC profile header; do the basic header checks. 1416b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1417b50c217251b086440efcdb273c22f86a06c80cbaChris Craik const png_uint_32 profile_length = 1418b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_get_uint_32(profile_header); 1419893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1420b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_icc_check_length(png_ptr, &png_ptr->colorspace, 1421b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keyword, profile_length)) 1422b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1423b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The length is apparently ok, so we can check the 132 1424b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * byte header. 1425b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1426b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_icc_check_header(png_ptr, &png_ptr->colorspace, 1427b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keyword, profile_length, profile_header, 1428b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->color_type)) 1429b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1430b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Now read the tag table; a variable size buffer is 1431b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * needed at this point, allocate one for the whole 1432b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * profile. The header check has already validated 1433b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * that none of these stuff will overflow. 1434b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1435b50c217251b086440efcdb273c22f86a06c80cbaChris Craik const png_uint_32 tag_count = png_get_uint_32( 1436b50c217251b086440efcdb273c22f86a06c80cbaChris Craik profile_header+128); 1437b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep profile = png_read_buffer(png_ptr, 1438b50c217251b086440efcdb273c22f86a06c80cbaChris Craik profile_length, 2/*silent*/); 1439b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1440b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (profile != NULL) 1441b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1442b50c217251b086440efcdb273c22f86a06c80cbaChris Craik memcpy(profile, profile_header, 1443b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (sizeof profile_header)); 1444b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1445b50c217251b086440efcdb273c22f86a06c80cbaChris Craik size = 12 * tag_count; 1446b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1447b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (void)png_inflate_read(png_ptr, local_buffer, 1448b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (sizeof local_buffer), &length, 1449b50c217251b086440efcdb273c22f86a06c80cbaChris Craik profile + (sizeof profile_header), &size, 0); 1450b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1451b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari /* Still expect a buffer error because we expect 1452b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * there to be some tag data! 1453b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1454b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (size == 0) 1455b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1456b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_icc_check_tag_table(png_ptr, 1457b50c217251b086440efcdb273c22f86a06c80cbaChris Craik &png_ptr->colorspace, keyword, profile_length, 1458b50c217251b086440efcdb273c22f86a06c80cbaChris Craik profile)) 1459b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1460b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The profile has been validated for basic 1461b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * security issues, so read the whole thing in. 1462b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1463b50c217251b086440efcdb273c22f86a06c80cbaChris Craik size = profile_length - (sizeof profile_header) 1464b50c217251b086440efcdb273c22f86a06c80cbaChris Craik - 12 * tag_count; 1465b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1466b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (void)png_inflate_read(png_ptr, local_buffer, 1467b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (sizeof local_buffer), &length, 1468b50c217251b086440efcdb273c22f86a06c80cbaChris Craik profile + (sizeof profile_header) + 1469b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 12 * tag_count, &size, 1/*finish*/); 1470b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1471b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (length > 0 && !(png_ptr->flags & 1472b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_FLAG_BENIGN_ERRORS_WARN)) 1473b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "extra compressed data"; 1474b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1475b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* But otherwise allow extra data: */ 1476b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (size == 0) 1477b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1478b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (length > 0) 1479b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1480b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This can be handled completely, so 1481b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * keep going. 1482b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1483b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_warning(png_ptr, 1484b50c217251b086440efcdb273c22f86a06c80cbaChris Craik "extra compressed data"); 1485b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1486b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1487b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 1488b50c217251b086440efcdb273c22f86a06c80cbaChris Craik finished = 1; 1489b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1490b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_sRGB_SUPPORTED 1491b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Check for a match against sRGB */ 1492b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_icc_set_sRGB(png_ptr, 1493b50c217251b086440efcdb273c22f86a06c80cbaChris Craik &png_ptr->colorspace, profile, 1494b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.adler); 1495b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 1496b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1497b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Steal the profile for info_ptr. */ 1498b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (info_ptr != NULL) 1499b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1500b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_free_data(png_ptr, info_ptr, 1501b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_FREE_ICCP, 0); 1502b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1503b50c217251b086440efcdb273c22f86a06c80cbaChris Craik info_ptr->iccp_name = png_voidcast(char*, 1504b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_malloc_base(png_ptr, 1505b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keyword_length+1)); 1506b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (info_ptr->iccp_name != NULL) 1507b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1508b50c217251b086440efcdb273c22f86a06c80cbaChris Craik memcpy(info_ptr->iccp_name, keyword, 1509b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keyword_length+1); 1510b50c217251b086440efcdb273c22f86a06c80cbaChris Craik info_ptr->iccp_proflen = 1511b50c217251b086440efcdb273c22f86a06c80cbaChris Craik profile_length; 1512b50c217251b086440efcdb273c22f86a06c80cbaChris Craik info_ptr->iccp_profile = profile; 1513b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer = NULL; /*steal*/ 1514b50c217251b086440efcdb273c22f86a06c80cbaChris Craik info_ptr->free_me |= PNG_FREE_ICCP; 1515b50c217251b086440efcdb273c22f86a06c80cbaChris Craik info_ptr->valid |= PNG_INFO_iCCP; 1516b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1517b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1518b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 1519b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1520b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->colorspace.flags |= 1521b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_COLORSPACE_INVALID; 1522b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "out of memory"; 1523b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1524b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1525b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1526b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* else the profile remains in the read 1527b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * buffer which gets reused for subsequent 1528b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * chunks. 1529b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1530b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1531b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (info_ptr != NULL) 1532b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspace_sync(png_ptr, info_ptr); 1533b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1534b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (errmsg == NULL) 1535b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1536b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zowner = 0; 1537b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 1538b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1539b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1540b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1541b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (size > 0) 1542b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "truncated"; 1543b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1544b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 1545b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = png_ptr->zstream.msg; 1546b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1547b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1548b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* else png_icc_check_tag_table output an error */ 1549b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1550b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1551b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* profile truncated */ 1552b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = png_ptr->zstream.msg; 1553b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1554b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1555b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 1556b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "out of memory"; 1557b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1558b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1559b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* else png_icc_check_header output an error */ 1560b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1561893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1562b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* else png_icc_check_length output an error */ 1563b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1564893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1565b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* profile truncated */ 1566b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = png_ptr->zstream.msg; 1567893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1568b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Release the stream */ 1569b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zowner = 0; 1570b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1571b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1572b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* png_inflate_claim failed */ 1573b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = png_ptr->zstream.msg; 1574b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1575b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1576b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 1577b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "bad compression method"; /* or missing */ 1578b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1579b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1580b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 1581b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "bad keyword"; 1582893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1583893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1584b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 1585b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "too many profiles"; 1586b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1587b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Failure: the reason is in 'errmsg' */ 1588b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (!finished) 1589b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 1590b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1591b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID; 1592b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspace_sync(png_ptr, info_ptr); 1593b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (errmsg != NULL) /* else already output */ 1594b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, errmsg); 1595893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 1596893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif /* PNG_READ_iCCP_SUPPORTED */ 1597893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 15985f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_sPLT_SUPPORTED 1599893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 1600b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_sPLT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 1601893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* Note: this does not properly handle chunks that are > 64K under DOS */ 1602893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 1603b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep entry_start, buffer; 1604893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_sPLT_t new_palette; 1605893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_sPLT_entryp pp; 1606b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 data_length; 1607b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int entry_size, i; 1608893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 skip = 0; 1609b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 dl; 1610b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t max_dl; 1611893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 16124215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_sPLT"); 16134215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 16145f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_USER_LIMITS_SUPPORTED 16155f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (png_ptr->user_chunk_cache_max != 0) 16165f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 16175f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (png_ptr->user_chunk_cache_max == 1) 16185f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 16195f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_crc_finish(png_ptr, length); 16205f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott return; 16215f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 1622b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 16235f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (--png_ptr->user_chunk_cache_max == 1) 16245f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 16255f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_warning(png_ptr, "No space in chunk cache for sPLT"); 16265f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_crc_finish(png_ptr, length); 16275f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott return; 16285f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 16295f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 16305f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#endif 1631893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1632893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 1633b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 1634b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1635893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->mode & PNG_HAVE_IDAT) 1636893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1637893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1638b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 1639893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1640893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1641893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1642893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef PNG_MAX_MALLOC_64K 1643b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (length > 65535U) 1644893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1645b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 1646b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "too large to fit in memory"); 1647b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 1648893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1649893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 1650893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1651b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/); 1652b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buffer == NULL) 1653893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1654b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 1655b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of memory"); 1656893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1657893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1658893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1659893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1660b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* WARNING: this may break if size_t is less than 32 bits; it is assumed 1661b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * that the PNG_MAX_MALLOC_64K test is enabled in this case, but this is a 1662b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * potential breakage point if the types in pngconf.h aren't exactly right. 1663b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1664b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, buffer, length); 1665b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1666b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_crc_finish(png_ptr, skip)) 1667b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 1668b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1669b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer[length] = 0; 1670b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1671b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (entry_start = buffer; *entry_start; entry_start++) 1672a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Empty loop to find end of name */ ; 1673b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1674893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project ++entry_start; 1675893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1676a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* A sample depth should follow the separator, and we should be on it */ 1677b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (entry_start > buffer + length - 2) 1678893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1679893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_warning(png_ptr, "malformed sPLT chunk"); 1680893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1681893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1682893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1683893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project new_palette.depth = *entry_start++; 1684893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project entry_size = (new_palette.depth == 8 ? 6 : 10); 1685b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This must fit in a png_uint_32 because it is derived from the original 1686b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * chunk data length. 1687b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1688b50c217251b086440efcdb273c22f86a06c80cbaChris Craik data_length = length - (png_uint_32)(entry_start - buffer); 1689893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1690a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Integrity-check the data length */ 1691893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (data_length % entry_size) 1692893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1693893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_warning(png_ptr, "sPLT chunk has bad length"); 1694893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1695893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1696893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1697b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dl = (png_int_32)(data_length / entry_size); 1698b50c217251b086440efcdb273c22f86a06c80cbaChris Craik max_dl = PNG_SIZE_MAX / (sizeof (png_sPLT_entry)); 1699b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1700b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (dl > max_dl) 1701893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1702893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_warning(png_ptr, "sPLT chunk too long"); 1703893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1704893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1705b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1706b50c217251b086440efcdb273c22f86a06c80cbaChris Craik new_palette.nentries = (png_int_32)(data_length / entry_size); 1707b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1708893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project new_palette.entries = (png_sPLT_entryp)png_malloc_warn( 1709b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr, new_palette.nentries * (sizeof (png_sPLT_entry))); 1710b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1711893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (new_palette.entries == NULL) 1712893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1713893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_warning(png_ptr, "sPLT chunk requires too much memory"); 1714893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1715893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1716893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 17175f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_POINTER_INDEXING_SUPPORTED 1718893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0; i < new_palette.nentries; i++) 1719893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 17205f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott pp = new_palette.entries + i; 1721893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1722893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (new_palette.depth == 8) 1723893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1724b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->red = *entry_start++; 1725b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->green = *entry_start++; 1726b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->blue = *entry_start++; 1727b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->alpha = *entry_start++; 1728893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1729b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1730893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 1731893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1732b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->red = png_get_uint_16(entry_start); entry_start += 2; 1733b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->green = png_get_uint_16(entry_start); entry_start += 2; 1734b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->blue = png_get_uint_16(entry_start); entry_start += 2; 1735b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->alpha = png_get_uint_16(entry_start); entry_start += 2; 1736893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1737b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1738893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project pp->frequency = png_get_uint_16(entry_start); entry_start += 2; 1739893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1740893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#else 1741893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project pp = new_palette.entries; 1742b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1743893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0; i < new_palette.nentries; i++) 1744893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1745893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1746893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (new_palette.depth == 8) 1747893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1748b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp[i].red = *entry_start++; 1749b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp[i].green = *entry_start++; 1750b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp[i].blue = *entry_start++; 1751b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp[i].alpha = *entry_start++; 1752893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1753b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1754893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 1755893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1756b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp[i].red = png_get_uint_16(entry_start); entry_start += 2; 1757b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp[i].green = png_get_uint_16(entry_start); entry_start += 2; 1758b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp[i].blue = png_get_uint_16(entry_start); entry_start += 2; 1759b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2; 1760893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1761b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1762b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp[i].frequency = png_get_uint_16(entry_start); entry_start += 2; 1763893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1764893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 1765893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1766a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Discard all chunk data except the name and stash that */ 1767b50c217251b086440efcdb273c22f86a06c80cbaChris Craik new_palette.name = (png_charp)buffer; 1768893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1769893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_sPLT(png_ptr, info_ptr, &new_palette, 1); 1770893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1771893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_free(png_ptr, new_palette.entries); 1772893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 1773893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif /* PNG_READ_sPLT_SUPPORTED */ 1774893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 17755f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_tRNS_SUPPORTED 1776893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 1777b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_tRNS(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 1778893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 1779893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte readbuf[PNG_MAX_PALETTE_LENGTH]; 1780893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 17814215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_tRNS"); 1782893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1783893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 1784b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 1785b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1786893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->mode & PNG_HAVE_IDAT) 1787893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1788893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1789b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 1790893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1791893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1792b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1793893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) 1794893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1795893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1796b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "duplicate"); 1797893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1798893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1799893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1800893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) 1801893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1802893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[2]; 1803893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1804893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != 2) 1805893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1806893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1807b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 1808893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1809893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1810893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1811893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, 2); 1812893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->num_trans = 1; 1813b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->trans_color.gray = png_get_uint_16(buf); 1814893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1815b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1816893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) 1817893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1818893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[6]; 1819893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1820893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != 6) 1821893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1822893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1823b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 1824893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1825893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1826b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1827b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, buf, length); 1828893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->num_trans = 1; 1829b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->trans_color.red = png_get_uint_16(buf); 1830b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->trans_color.green = png_get_uint_16(buf + 2); 1831b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->trans_color.blue = png_get_uint_16(buf + 4); 1832893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1833b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1834893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 1835893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1836893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_PLTE)) 1837893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1838b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* TODO: is this actually an error in the ISO spec? */ 1839893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1840b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 1841893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1842893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1843b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1844b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (length > png_ptr->num_palette || length > PNG_MAX_PALETTE_LENGTH || 1845b50c217251b086440efcdb273c22f86a06c80cbaChris Craik length == 0) 1846893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1847893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1848b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 1849893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1850893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1851b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1852b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, readbuf, length); 1853893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->num_trans = (png_uint_16)length; 1854893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1855b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1856893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 1857893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1858893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1859b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid with alpha channel"); 1860893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1861893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1862893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1863893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 1864893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1865893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->num_trans = 0; 1866893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1867893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1868893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1869b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* TODO: this is a horrible side effect in the palette case because the 1870b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * png_struct ends up with a pointer to the tRNS buffer owned by the 1871b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * png_info. Fix this. 1872b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1873893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans, 1874b50c217251b086440efcdb273c22f86a06c80cbaChris Craik &(png_ptr->trans_color)); 1875893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 1876893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 1877893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 18785f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_bKGD_SUPPORTED 1879893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 1880b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_bKGD(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 1881893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 1882b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int truelen; 1883893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[6]; 1884b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_color_16 background; 1885893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 18864215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_bKGD"); 1887893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1888893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 1889b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 1890b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1891b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if ((png_ptr->mode & PNG_HAVE_IDAT) || 1892b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && 1893b50c217251b086440efcdb273c22f86a06c80cbaChris Craik !(png_ptr->mode & PNG_HAVE_PLTE))) 1894893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1895893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1896b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 1897893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1898893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1899b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1900893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)) 1901893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1902893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1903b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "duplicate"); 1904893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1905893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1906893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1907893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 1908893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project truelen = 1; 1909b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1910893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) 1911893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project truelen = 6; 1912b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1913893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 1914893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project truelen = 2; 1915893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1916893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != truelen) 1917893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1918893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1919b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 1920893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1921893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1922893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1923893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, truelen); 1924b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1925893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 1926893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1927893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1928893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* We convert the index value into RGB components so that we can allow 1929893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * arbitrary RGB values for background when we have transparency, and 1930893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * so it is easy to determine the RGB values of the background color 1931b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * from the info_ptr struct. 1932b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1933893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 1934893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1935b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.index = buf[0]; 1936b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1937893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (info_ptr && info_ptr->num_palette) 1938893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1939b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buf[0] >= info_ptr->num_palette) 1940b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 1941b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid index"); 1942b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 1943b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 1944b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1945b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.red = (png_uint_16)png_ptr->palette[buf[0]].red; 1946b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.green = (png_uint_16)png_ptr->palette[buf[0]].green; 1947b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.blue = (png_uint_16)png_ptr->palette[buf[0]].blue; 1948893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1949b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1950b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 1951b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.red = background.green = background.blue = 0; 1952b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1953b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.gray = 0; 1954893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1955b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1956893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */ 1957893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1958b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.index = 0; 1959b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.red = 1960b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.green = 1961b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.blue = 1962b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.gray = png_get_uint_16(buf); 1963893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1964b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1965893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 1966893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1967b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.index = 0; 1968b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.red = png_get_uint_16(buf); 1969b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.green = png_get_uint_16(buf + 2); 1970b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.blue = png_get_uint_16(buf + 4); 1971b50c217251b086440efcdb273c22f86a06c80cbaChris Craik background.gray = 0; 1972893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1973893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1974b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_set_bKGD(png_ptr, info_ptr, &background); 1975893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 1976893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 1977893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 19785f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_hIST_SUPPORTED 1979893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 1980b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_hIST(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 1981893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 1982893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project unsigned int num, i; 1983893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH]; 1984893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 19854215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_hIST"); 1986893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 1987893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 1988b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 1989b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1990b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if ((png_ptr->mode & PNG_HAVE_IDAT) || !(png_ptr->mode & PNG_HAVE_PLTE)) 1991893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1992893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 1993b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 1994893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 1995893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 1996b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1997893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)) 1998893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 1999893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2000b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "duplicate"); 2001893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2002893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2003893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2004893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project num = length / 2 ; 2005b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2006b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (num != png_ptr->num_palette || num > PNG_MAX_PALETTE_LENGTH) 2007893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2008893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2009b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 2010893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2011893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2012893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2013893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0; i < num; i++) 2014893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2015893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[2]; 2016893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2017893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, 2); 2018893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project readbuf[i] = png_get_uint_16(buf); 2019893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2020893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2021893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 2022893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2023893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2024893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_hIST(png_ptr, info_ptr, readbuf); 2025893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 2026893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 2027893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 20285f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_pHYs_SUPPORTED 2029893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 2030b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_pHYs(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 2031893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 2032893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[9]; 2033893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 res_x, res_y; 2034893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int unit_type; 2035893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 20364215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_pHYs"); 2037893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2038893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 2039b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 2040b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2041893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->mode & PNG_HAVE_IDAT) 2042893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2043893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2044b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 2045893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2046893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2047b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2048893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) 2049893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2050893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2051b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "duplicate"); 2052893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2053893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2054893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2055893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != 9) 2056893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2057893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2058b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 2059893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2060893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2061893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2062893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, 9); 2063b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2064893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 2065893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2066893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2067893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project res_x = png_get_uint_32(buf); 2068893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project res_y = png_get_uint_32(buf + 4); 2069893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project unit_type = buf[8]; 2070893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type); 2071893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 2072893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 2073893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 20745f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_oFFs_SUPPORTED 2075893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 2076b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_oFFs(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 2077893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 2078893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[9]; 2079893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_int_32 offset_x, offset_y; 2080893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int unit_type; 2081893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 20824215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_oFFs"); 2083893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2084893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 2085b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 2086b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2087893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->mode & PNG_HAVE_IDAT) 2088893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2089893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2090b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 2091893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2092893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2093b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2094893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) 2095893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2096893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2097b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "duplicate"); 2098893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2099893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2100893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2101893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != 9) 2102893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2103893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2104b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 2105893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2106893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2107893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2108893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, 9); 2109b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2110893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 2111893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2112893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2113893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project offset_x = png_get_int_32(buf); 2114893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project offset_y = png_get_int_32(buf + 4); 2115893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project unit_type = buf[8]; 2116893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type); 2117893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 2118893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 2119893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 21205f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_pCAL_SUPPORTED 2121a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott/* Read the pCAL chunk (described in the PNG Extensions document) */ 2122893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 2123b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_pCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 2124893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 2125893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_int_32 X0, X1; 2126893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte type, nparams; 2127b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer, buf, units, endptr; 2128893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_charpp params; 2129893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int i; 2130893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 21314215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_pCAL"); 2132893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2133893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 2134b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 2135b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2136893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->mode & PNG_HAVE_IDAT) 2137893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2138893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2139b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 2140893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2141893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2142b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2143893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)) 2144893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2145893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2146b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "duplicate"); 2147893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2148893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2149893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2150b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_debug1(2, "Allocating and reading pCAL chunk data (%u bytes)", 2151b50c217251b086440efcdb273c22f86a06c80cbaChris Craik length + 1); 2152893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2153b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/); 2154b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2155b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buffer == NULL) 2156893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2157b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 2158b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of memory"); 2159893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2160893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2161893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2162b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, buffer, length); 2163b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2164b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_crc_finish(png_ptr, 0)) 2165b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 2166b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2167b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer[length] = 0; /* Null terminate the last string */ 2168893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 21694215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(3, "Finding end of pCAL purpose string"); 2170b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (buf = buffer; *buf; buf++) 2171a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Empty loop */ ; 2172893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2173b50c217251b086440efcdb273c22f86a06c80cbaChris Craik endptr = buffer + length; 2174893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2175893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* We need to have at least 12 bytes after the purpose string 2176b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * in order to get the parameter information. 2177b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2178893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (endptr <= buf + 12) 2179893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2180b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 2181893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2182893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2183893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 21844215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(3, "Reading pCAL X0, X1, type, nparams, and units"); 2185893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project X0 = png_get_int_32((png_bytep)buf+1); 2186893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project X1 = png_get_int_32((png_bytep)buf+5); 2187893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project type = buf[9]; 2188893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project nparams = buf[10]; 2189893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project units = buf + 11; 2190893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 21914215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(3, "Checking pCAL equation type and number of parameters"); 2192893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* Check that we have the right number of parameters for known 2193b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * equation types. 2194b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2195893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((type == PNG_EQUATION_LINEAR && nparams != 2) || 2196893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project (type == PNG_EQUATION_BASE_E && nparams != 3) || 2197893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project (type == PNG_EQUATION_ARBITRARY && nparams != 3) || 2198893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project (type == PNG_EQUATION_HYPERBOLIC && nparams != 4)) 2199893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2200b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid parameter count"); 2201893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2202893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2203b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2204893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (type >= PNG_EQUATION_LAST) 2205893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2206b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "unrecognized equation type"); 2207893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2208893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2209893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (buf = units; *buf; buf++) 2210893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* Empty loop to move past the units string. */ ; 2211893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 22124215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(3, "Allocating pCAL parameters array"); 2213b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2214b50c217251b086440efcdb273c22f86a06c80cbaChris Craik params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, 2215b50c217251b086440efcdb273c22f86a06c80cbaChris Craik nparams * (sizeof (png_charp)))); 2216b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2217893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (params == NULL) 2218b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2219b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of memory"); 2220b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 2221b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2222893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2223893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* Get pointers to the start of each parameter string. */ 2224b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (i = 0; i < nparams; i++) 2225893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2226893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project buf++; /* Skip the null string terminator from previous parameter. */ 2227893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 22284215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug1(3, "Reading pCAL parameter %d", i); 2229b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2230b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (params[i] = (png_charp)buf; buf <= endptr && *buf != 0; buf++) 2231893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* Empty loop to move past each parameter string */ ; 2232893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2233893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* Make sure we haven't run out of data yet */ 2234893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (buf > endptr) 2235893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2236893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_free(png_ptr, params); 2237b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid data"); 2238893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2239893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2240893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2241893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2242b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_set_pCAL(png_ptr, info_ptr, (png_charp)buffer, X0, X1, type, nparams, 2243b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_charp)units, params); 2244893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2245893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_free(png_ptr, params); 2246893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 2247893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 2248893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 22495f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_sCAL_SUPPORTED 2250a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott/* Read the sCAL chunk */ 2251893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 2252b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_sCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 2253893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 2254b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer; 2255b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t i; 2256b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int state; 2257893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 22584215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_sCAL"); 2259893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2260893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 2261b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 2262b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2263893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->mode & PNG_HAVE_IDAT) 2264893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2265893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2266b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of place"); 2267893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2268893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2269b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2270893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL)) 2271893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2272893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2273b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "duplicate"); 2274893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2275893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2276893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 227766dce0da6a5db51ee0c2875517d3a6ca6cbbe53dEric Vannier /* Need unit type, width, \0, height: minimum 4 bytes */ 227866dce0da6a5db51ee0c2875517d3a6ca6cbbe53dEric Vannier else if (length < 4) 227966dce0da6a5db51ee0c2875517d3a6ca6cbbe53dEric Vannier { 228066dce0da6a5db51ee0c2875517d3a6ca6cbbe53dEric Vannier png_crc_finish(png_ptr, length); 2281b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 228266dce0da6a5db51ee0c2875517d3a6ca6cbbe53dEric Vannier return; 228366dce0da6a5db51ee0c2875517d3a6ca6cbbe53dEric Vannier } 228466dce0da6a5db51ee0c2875517d3a6ca6cbbe53dEric Vannier 2285b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_debug1(2, "Allocating and reading sCAL chunk data (%u bytes)", 2286893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project length + 1); 2287b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2288b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/); 2289b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2290b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buffer == NULL) 22914215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project { 2292b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of memory"); 22935f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_crc_finish(png_ptr, length); 22944215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project return; 22954215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project } 2296b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2297b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, buffer, length); 2298b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer[length] = 0; /* Null terminate the last string */ 2299893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2300893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 2301b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 2302b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2303b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Validate the unit. */ 2304b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buffer[0] != 1 && buffer[0] != 2) 2305893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2306b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid unit"); 2307893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2308893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2309893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2310b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Validate the ASCII numbers, need two ASCII numbers separated by 2311b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * a '\0' and they need to fit exactly in the chunk data. 2312b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2313b50c217251b086440efcdb273c22f86a06c80cbaChris Craik i = 1; 2314b50c217251b086440efcdb273c22f86a06c80cbaChris Craik state = 0; 2315b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2316b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (!png_check_fp_number((png_const_charp)buffer, length, &state, &i) || 2317b50c217251b086440efcdb273c22f86a06c80cbaChris Craik i >= length || buffer[i++] != 0) 2318b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "bad width format"); 2319893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2320b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (!PNG_FP_IS_POSITIVE(state)) 2321b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "non-positive width"); 2322893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2323b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 2324893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2325b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t heighti = i; 2326893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2327b50c217251b086440efcdb273c22f86a06c80cbaChris Craik state = 0; 2328b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (!png_check_fp_number((png_const_charp)buffer, length, &state, &i) || 2329b50c217251b086440efcdb273c22f86a06c80cbaChris Craik i != length) 2330b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "bad height format"); 2331893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2332b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (!PNG_FP_IS_POSITIVE(state)) 2333b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "non-positive height"); 2334893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2335b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 2336b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is the (only) success case. */ 2337b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_set_sCAL_s(png_ptr, info_ptr, buffer[0], 2338b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_charp)buffer+1, (png_charp)buffer+heighti); 2339893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2340893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 2341893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 2342893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 23435f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_tIME_SUPPORTED 2344893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 2345b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_tIME(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 2346893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 2347893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[7]; 2348893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_time mod_time; 2349893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 23504215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_tIME"); 2351893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2352893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 2353b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 2354b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2355893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)) 2356893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2357893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2358b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "duplicate"); 2359893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2360893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2361893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2362893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->mode & PNG_HAVE_IDAT) 2363893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->mode |= PNG_AFTER_IDAT; 2364893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2365893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (length != 7) 2366893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2367893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_finish(png_ptr, length); 2368b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "invalid"); 2369893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2370893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2371893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2372893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_crc_read(png_ptr, buf, 7); 2373b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2374893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 2375893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2376893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2377893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project mod_time.second = buf[6]; 2378893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project mod_time.minute = buf[5]; 2379893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project mod_time.hour = buf[4]; 2380893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project mod_time.day = buf[3]; 2381893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project mod_time.month = buf[2]; 2382893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project mod_time.year = png_get_uint_16(buf); 2383893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2384893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_tIME(png_ptr, info_ptr, &mod_time); 2385893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 2386893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 2387893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 23885f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_tEXt_SUPPORTED 2389893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* Note: this does not properly handle chunks that are > 64K under DOS */ 2390893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 2391b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_tEXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 2392893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 2393b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_text text_info; 2394b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer; 2395893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_charp key; 2396893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_charp text; 2397893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 skip = 0; 2398893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 23994215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_tEXt"); 24004215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 24015f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_USER_LIMITS_SUPPORTED 24025f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (png_ptr->user_chunk_cache_max != 0) 24035f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 24045f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (png_ptr->user_chunk_cache_max == 1) 24055f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 24065f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_crc_finish(png_ptr, length); 24075f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott return; 24085f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 2409b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 24105f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (--png_ptr->user_chunk_cache_max == 1) 24115f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 24125f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_crc_finish(png_ptr, length); 2413b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "no space in chunk cache"); 24145f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott return; 24155f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 24165f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 24175f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#endif 2418893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2419893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 2420b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 2421893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2422893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->mode & PNG_HAVE_IDAT) 2423893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->mode |= PNG_AFTER_IDAT; 2424893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2425893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef PNG_MAX_MALLOC_64K 2426b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (length > 65535U) 2427893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2428b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 2429b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "too large to fit in memory"); 2430b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 2431893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2432893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 2433893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2434b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = png_read_buffer(png_ptr, length+1, 1/*warn*/); 24354215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 2436b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buffer == NULL) 2437893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2438b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of memory"); 2439893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2440893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2441b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2442b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, buffer, length); 2443893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2444893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, skip)) 2445893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2446893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2447b50c217251b086440efcdb273c22f86a06c80cbaChris Craik key = (png_charp)buffer; 2448b50c217251b086440efcdb273c22f86a06c80cbaChris Craik key[length] = 0; 2449893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2450893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (text = key; *text; text++) 2451a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Empty loop to find end of key */ ; 2452893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2453b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (text != key + length) 2454893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project text++; 2455893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2456b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text_info.compression = PNG_TEXT_COMPRESSION_NONE; 2457b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text_info.key = key; 2458b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text_info.lang = NULL; 2459b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text_info.lang_key = NULL; 2460b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text_info.itxt_length = 0; 2461b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text_info.text = text; 2462b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text_info.text_length = strlen(text); 2463893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2464b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_set_text_2(png_ptr, info_ptr, &text_info, 1)) 2465b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_warning(png_ptr, "Insufficient memory to process text chunk"); 2466893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 2467893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 2468893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 24695f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_zTXt_SUPPORTED 2470a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott/* Note: this does not correctly handle chunks that are > 64K under DOS */ 2471893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 2472b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_zTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 2473893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 2474b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp errmsg = NULL; 2475b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer; 2476b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 keyword_length; 2477893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 24784215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_zTXt"); 24794215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 24805f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_USER_LIMITS_SUPPORTED 24815f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (png_ptr->user_chunk_cache_max != 0) 24825f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 24835f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (png_ptr->user_chunk_cache_max == 1) 24845f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 24855f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_crc_finish(png_ptr, length); 24865f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott return; 24875f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 2488b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 24895f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (--png_ptr->user_chunk_cache_max == 1) 24905f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 24915f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_crc_finish(png_ptr, length); 2492b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "no space in chunk cache"); 24935f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott return; 24945f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 24955f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 24965f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#endif 24974215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 2498893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 2499b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 2500893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2501893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->mode & PNG_HAVE_IDAT) 2502893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->mode |= PNG_AFTER_IDAT; 2503893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2504b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = png_read_buffer(png_ptr, length, 2/*silent*/); 2505893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2506b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buffer == NULL) 2507893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2508b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 2509b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of memory"); 2510b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 2511893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2512b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2513b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, buffer, length); 2514b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2515893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_crc_finish(png_ptr, 0)) 2516893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2517893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2518b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* TODO: also check that the keyword contents match the spec! */ 2519b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (keyword_length = 0; 2520b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keyword_length < length && buffer[keyword_length] != 0; 2521b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ++keyword_length) 2522b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Empty loop to find end of name */ ; 2523893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2524b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (keyword_length > 79 || keyword_length < 1) 2525b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "bad keyword"; 2526b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2527b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* zTXt must have some LZ data after the keyword, although it may expand to 2528b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * zero bytes; we need a '\0' at the end of the keyword, the compression type 2529b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * then the LZ data: 2530b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2531b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (keyword_length + 3 > length) 2532b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "truncated"; 2533b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2534b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (buffer[keyword_length+1] != PNG_COMPRESSION_TYPE_BASE) 2535b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "unknown compression type"; 2536893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2537893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 2538893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2539b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t uncompressed_length = PNG_SIZE_MAX; 2540893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2541b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* TODO: at present png_decompress_chunk imposes a single application 2542b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * level memory limit, this should be split to different values for iCCP 2543b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * and text chunks. 2544b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2545b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_decompress_chunk(png_ptr, length, keyword_length+2, 2546b50c217251b086440efcdb273c22f86a06c80cbaChris Craik &uncompressed_length, 1/*terminate*/) == Z_STREAM_END) 2547b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2548b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_text text; 2549b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2550b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* It worked; png_ptr->read_buffer now looks like a tEXt chunk except 2551b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * for the extra compression type byte and the fact that it isn't 2552b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * necessarily '\0' terminated. 2553b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2554b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = png_ptr->read_buffer; 2555b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer[uncompressed_length+(keyword_length+2)] = 0; 2556b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2557b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.compression = PNG_TEXT_COMPRESSION_zTXt; 2558b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.key = (png_charp)buffer; 2559b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.text = (png_charp)(buffer + keyword_length+2); 2560b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.text_length = uncompressed_length; 2561b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.itxt_length = 0; 2562b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.lang = NULL; 2563b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.lang_key = NULL; 2564b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2565b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_set_text_2(png_ptr, info_ptr, &text, 1)) 2566b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "insufficient memory"; 2567b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2568893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2569b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 2570b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = png_ptr->zstream.msg; 2571893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2572893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2573b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (errmsg != NULL) 2574b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, errmsg); 2575893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 2576893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 2577893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 25785f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_iTXt_SUPPORTED 2579a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott/* Note: this does not correctly handle chunks that are > 64K under DOS */ 2580893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 2581b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_iTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) 2582893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 2583b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp errmsg = NULL; 2584b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer; 2585b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 prefix_length; 2586893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 25874215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_iTXt"); 25884215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 25895f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_USER_LIMITS_SUPPORTED 25905f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (png_ptr->user_chunk_cache_max != 0) 25915f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 25925f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (png_ptr->user_chunk_cache_max == 1) 25935f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 25945f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_crc_finish(png_ptr, length); 25955f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott return; 25965f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 2597b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 25985f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott if (--png_ptr->user_chunk_cache_max == 1) 25995f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 26005f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_crc_finish(png_ptr, length); 2601b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "no space in chunk cache"); 26025f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott return; 26035f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 26045f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 26055f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#endif 2606893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2607893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->mode & PNG_HAVE_IHDR)) 2608b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "missing IHDR"); 2609893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2610893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->mode & PNG_HAVE_IDAT) 2611893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->mode |= PNG_AFTER_IDAT; 2612893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2613b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = png_read_buffer(png_ptr, length+1, 1/*warn*/); 2614893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2615b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (buffer == NULL) 2616893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2617b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 2618b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "out of memory"); 2619893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 2620893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2621893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2622b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, buffer, length); 2623b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2624b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_crc_finish(png_ptr, 0)) 2625b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 2626893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2627b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* First the keyword. */ 2628b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (prefix_length=0; 2629b50c217251b086440efcdb273c22f86a06c80cbaChris Craik prefix_length < length && buffer[prefix_length] != 0; 2630b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ++prefix_length) 2631a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Empty loop */ ; 2632893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2633b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Perform a basic check on the keyword length here. */ 2634b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (prefix_length > 79 || prefix_length < 1) 2635b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "bad keyword"; 2636b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2637b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Expect keyword, compression flag, compression type, language, translated 2638b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * keyword (both may be empty but are 0 terminated) then the text, which may 2639b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * be empty. 2640a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott */ 2641b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (prefix_length + 5 > length) 2642b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "truncated"; 2643893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2644b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (buffer[prefix_length+1] == 0 || 2645b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (buffer[prefix_length+1] == 1 && 2646b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer[prefix_length+2] == PNG_COMPRESSION_TYPE_BASE)) 2647893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2648b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int compressed = buffer[prefix_length+1] != 0; 2649b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 language_offset, translated_keyword_offset; 2650b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t uncompressed_length = 0; 2651b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2652b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Now the language tag */ 2653b50c217251b086440efcdb273c22f86a06c80cbaChris Craik prefix_length += 3; 2654b50c217251b086440efcdb273c22f86a06c80cbaChris Craik language_offset = prefix_length; 2655b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2656b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (; prefix_length < length && buffer[prefix_length] != 0; 2657b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ++prefix_length) 2658b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Empty loop */ ; 2659b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2660b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* WARNING: the length may be invalid here, this is checked below. */ 2661b50c217251b086440efcdb273c22f86a06c80cbaChris Craik translated_keyword_offset = ++prefix_length; 2662b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2663b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (; prefix_length < length && buffer[prefix_length] != 0; 2664b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ++prefix_length) 2665b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Empty loop */ ; 2666b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2667b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* prefix_length should now be at the trailing '\0' of the translated 2668b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * keyword, but it may already be over the end. None of this arithmetic 2669b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * can overflow because chunks are at most 2^31 bytes long, but on 16-bit 2670b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * systems the available allocaton may overflow. 2671b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2672b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ++prefix_length; 2673b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2674b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (!compressed && prefix_length <= length) 2675b50c217251b086440efcdb273c22f86a06c80cbaChris Craik uncompressed_length = length - prefix_length; 2676b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2677b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (compressed && prefix_length < length) 2678b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2679b50c217251b086440efcdb273c22f86a06c80cbaChris Craik uncompressed_length = PNG_SIZE_MAX; 2680b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2681b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* TODO: at present png_decompress_chunk imposes a single application 2682b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * level memory limit, this should be split to different values for 2683b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * iCCP and text chunks. 2684b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2685b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_decompress_chunk(png_ptr, length, prefix_length, 2686b50c217251b086440efcdb273c22f86a06c80cbaChris Craik &uncompressed_length, 1/*terminate*/) == Z_STREAM_END) 2687b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = png_ptr->read_buffer; 2688b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2689b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 2690b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = png_ptr->zstream.msg; 2691b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2692b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2693b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 2694b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "truncated"; 2695b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2696b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (errmsg == NULL) 2697b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2698b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_text text; 2699b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2700b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer[uncompressed_length+prefix_length] = 0; 2701b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2702b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (compressed) 2703b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.compression = PNG_ITXT_COMPRESSION_NONE; 2704b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2705b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 2706b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.compression = PNG_ITXT_COMPRESSION_zTXt; 2707b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2708b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.key = (png_charp)buffer; 2709b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.lang = (png_charp)buffer + language_offset; 2710b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.lang_key = (png_charp)buffer + translated_keyword_offset; 2711b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.text = (png_charp)buffer + prefix_length; 2712b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.text_length = 0; 2713b50c217251b086440efcdb273c22f86a06c80cbaChris Craik text.itxt_length = uncompressed_length; 2714b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2715b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_set_text_2(png_ptr, info_ptr, &text, 1)) 2716b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "insufficient memory"; 2717b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2718893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2719b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2720893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 2721b50c217251b086440efcdb273c22f86a06c80cbaChris Craik errmsg = "bad compression info"; 2722b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2723b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (errmsg != NULL) 2724b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, errmsg); 2725b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 2726b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 2727b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2728b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED 2729b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Utility function for png_handle_unknown; set up png_ptr::unknown_chunk */ 2730b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic int 2731b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_cache_unknown_chunk(png_structrp png_ptr, png_uint_32 length) 2732b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 2733b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t limit = PNG_SIZE_MAX; 2734b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2735b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->unknown_chunk.data != NULL) 2736893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2737b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_free(png_ptr, png_ptr->unknown_chunk.data); 2738b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->unknown_chunk.data = NULL; 2739893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2740893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2741b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED 2742b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->user_chunk_malloc_max > 0 && 2743b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->user_chunk_malloc_max < limit) 2744b50c217251b086440efcdb273c22f86a06c80cbaChris Craik limit = png_ptr->user_chunk_malloc_max; 2745893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2746b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# elif PNG_USER_CHUNK_MALLOC_MAX > 0 2747b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (PNG_USER_CHUNK_MALLOC_MAX < limit) 2748b50c217251b086440efcdb273c22f86a06c80cbaChris Craik limit = PNG_USER_CHUNK_MALLOC_MAX; 2749b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 2750b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2751b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (length <= limit) 2752893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2753b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_CSTRING_FROM_CHUNK(png_ptr->unknown_chunk.name, png_ptr->chunk_name); 2754b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The following is safe because of the PNG_SIZE_MAX init above */ 2755b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->unknown_chunk.size = (png_size_t)length/*SAFE*/; 2756b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 'mode' is a flag array, only the bottom four bits matter here */ 2757b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->unknown_chunk.location = (png_byte)png_ptr->mode/*SAFE*/; 2758b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2759b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (length == 0) 2760b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->unknown_chunk.data = NULL; 2761b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2762b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 2763b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2764b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Do a 'warn' here - it is handled below. */ 2765b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->unknown_chunk.data = png_voidcast(png_bytep, 2766b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_malloc_warn(png_ptr, length)); 2767b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2768893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2769893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2770b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->unknown_chunk.data == NULL && length > 0) 2771893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 2772b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is benign because we clean up correctly */ 2773b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 2774b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "unknown chunk exceeds memory limits"); 2775b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return 0; 2776893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2777893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2778893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 2779b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2780b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (length > 0) 2781b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, png_ptr->unknown_chunk.data, length); 2782b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, 0); 2783b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return 1; 2784893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 2785893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 2786b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ 2787893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2788b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Handle an unknown, or known but disabled, chunk */ 2789893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 2790b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_handle_unknown(png_structrp png_ptr, png_inforp info_ptr, 2791b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 length, int keep) 2792893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 2793b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int handled = 0; /* the chunk was handled */ 2794893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 27954215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_handle_unknown"); 27964215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project 2797b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED 2798b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* NOTE: this code is based on the code in libpng-1.4.12 except for fixing 2799b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the bug which meant that setting a non-default behavior for a specific 2800b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * chunk would be ignored (the default was always used unless a user 2801b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * callback was installed). 2802b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 2803b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 'keep' is the value from the png_chunk_unknown_handling, the setting for 2804b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this specific chunk_name, if PNG_HANDLE_AS_UNKNOWN_SUPPORTED, if not it 2805b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * will always be PNG_HANDLE_CHUNK_AS_DEFAULT and it needs to be set here. 2806b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * This is just an optimization to avoid multiple calls to the lookup 2807b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * function. 2808b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2809b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2810b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED 2811b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name); 2812b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 2813b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 2814b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2815b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* One of the following methods will read the chunk or skip it (at least one 2816b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * of these is always defined because this is the only way to switch on 2817b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) 2818b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2819b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_READ_USER_CHUNKS_SUPPORTED 2820b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The user callback takes precedence over the chunk keep value, but the 2821b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * keep value is still required to validate a save of a critical chunk. 2822b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2823b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->read_user_chunk_fn != NULL) 28245f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 2825b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_cache_unknown_chunk(png_ptr, length)) 2826b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2827b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Callback to user unknown chunk handler */ 2828b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int ret = (*(png_ptr->read_user_chunk_fn))(png_ptr, 2829b50c217251b086440efcdb273c22f86a06c80cbaChris Craik &png_ptr->unknown_chunk); 2830b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2831b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* ret is: 2832b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * negative: An error occured, png_chunk_error will be called. 2833b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * zero: The chunk was not handled, the chunk will be discarded 2834b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * unless png_set_keep_unknown_chunks has been used to set 2835b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * a 'keep' behavior for this particular chunk, in which 2836b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * case that will be used. A critical chunk will cause an 2837b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * error at this point unless it is to be saved. 2838b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * positive: The chunk was handled, libpng will ignore/discard it. 2839b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2840b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (ret < 0) 2841b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "error in user chunk"); 2842b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2843b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (ret == 0) 2844b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2845b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* If the keep value is 'default' or 'never' override it, but 2846b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * still error out on critical chunks unless the keep value is 2847b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 'always' While this is weird it is the behavior in 1.4.12. 2848b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * A possible improvement would be to obey the value set for the 2849b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * chunk, but this would be an API change that would probably 2850b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * damage some applications. 2851b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 2852b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The png_app_warning below catches the case that matters, where 2853b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the application has not set specific save or ignore for this 2854b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * chunk or global save or ignore. 2855b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2856b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (keep < PNG_HANDLE_CHUNK_IF_SAFE) 2857b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2858b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED 2859b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->unknown_default < PNG_HANDLE_CHUNK_IF_SAFE) 2860b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2861b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_warning(png_ptr, "Saving unknown chunk:"); 2862b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_app_warning(png_ptr, 2863b50c217251b086440efcdb273c22f86a06c80cbaChris Craik "forcing save of an unhandled chunk;" 2864b50c217251b086440efcdb273c22f86a06c80cbaChris Craik " please call png_set_keep_unknown_chunks"); 2865b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* with keep = PNG_HANDLE_CHUNK_IF_SAFE */ 2866b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2867b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 2868b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keep = PNG_HANDLE_CHUNK_IF_SAFE; 2869b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2870b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2871b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2872b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* chunk was handled */ 2873b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2874b50c217251b086440efcdb273c22f86a06c80cbaChris Craik handled = 1; 2875b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Critical chunks can be safely discarded at this point. */ 2876b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keep = PNG_HANDLE_CHUNK_NEVER; 2877b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2878b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2879b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2880b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 2881b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keep = PNG_HANDLE_CHUNK_NEVER; /* insufficient memory */ 28825f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 2883b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2884b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 2885b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Use the SAVE_UNKNOWN_CHUNKS code or skip the chunk */ 2886b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif /* PNG_READ_USER_CHUNKS_SUPPORTED */ 2887b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2888b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED 28895f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott { 2890b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* keep is currently just the per-chunk setting, if there was no 2891b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * setting change it to the global default now (not that this may 2892b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * still be AS_DEFAULT) then obtain the cache of the chunk if required, 2893b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * if not simply skip the chunk. 2894b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2895b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT) 2896b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keep = png_ptr->unknown_default; 2897b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2898b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (keep == PNG_HANDLE_CHUNK_ALWAYS || 2899b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (keep == PNG_HANDLE_CHUNK_IF_SAFE && 2900b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_CHUNK_ANCILLARY(png_ptr->chunk_name))) 2901b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2902b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (!png_cache_unknown_chunk(png_ptr, length)) 2903b50c217251b086440efcdb273c22f86a06c80cbaChris Craik keep = PNG_HANDLE_CHUNK_NEVER; 2904b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2905b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2906b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 2907b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 29085f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott } 2909b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 2910b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_READ_USER_CHUNKS_SUPPORTED 2911b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# error no method to support READ_UNKNOWN_CHUNKS 2912b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 2913893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2914b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2915b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* If here there is no read callback pointer set and no support is 2916b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * compiled in to just save the unknown chunks, so simply skip this 2917b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * chunk. If 'keep' is something other than AS_DEFAULT or NEVER then 2918b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the app has erroneously asked for unknown chunk saving when there 2919b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is no support. 2920b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2921b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (keep > PNG_HANDLE_CHUNK_NEVER) 2922b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_app_error(png_ptr, "no unknown chunk support available"); 2923893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2924b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 2925b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2926b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 2927893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2928b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED 2929b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Now store the chunk in the chunk list if appropriate, and if the limits 2930b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * permit it. 2931b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2932b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (keep == PNG_HANDLE_CHUNK_ALWAYS || 2933b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (keep == PNG_HANDLE_CHUNK_IF_SAFE && 2934b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_CHUNK_ANCILLARY(png_ptr->chunk_name))) 2935b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2936b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_USER_LIMITS_SUPPORTED 2937b50c217251b086440efcdb273c22f86a06c80cbaChris Craik switch (png_ptr->user_chunk_cache_max) 2938b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 2939b50c217251b086440efcdb273c22f86a06c80cbaChris Craik case 2: 2940b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->user_chunk_cache_max = 1; 2941b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "no space in chunk cache"); 2942b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* FALL THROUGH */ 2943b50c217251b086440efcdb273c22f86a06c80cbaChris Craik case 1: 2944b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* NOTE: prior to 1.6.0 this case resulted in an unknown critical 2945b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * chunk being skipped, now there will be a hard error below. 2946b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2947b50c217251b086440efcdb273c22f86a06c80cbaChris Craik break; 2948b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2949b50c217251b086440efcdb273c22f86a06c80cbaChris Craik default: /* not at limit */ 2950b50c217251b086440efcdb273c22f86a06c80cbaChris Craik --(png_ptr->user_chunk_cache_max); 2951b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* FALL THROUGH */ 2952b50c217251b086440efcdb273c22f86a06c80cbaChris Craik case 0: /* no limit */ 2953b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif /* PNG_USER_LIMITS_SUPPORTED */ 2954b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Here when the limit isn't reached or when limits are compiled 2955b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * out; store the chunk. 2956b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2957b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_set_unknown_chunks(png_ptr, info_ptr, 2958b50c217251b086440efcdb273c22f86a06c80cbaChris Craik &png_ptr->unknown_chunk, 1); 2959b50c217251b086440efcdb273c22f86a06c80cbaChris Craik handled = 1; 2960b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_USER_LIMITS_SUPPORTED 2961b50c217251b086440efcdb273c22f86a06c80cbaChris Craik break; 2962b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2963b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 2964b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 2965b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# else /* no store support: the chunk must be handled by the user callback */ 2966b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_UNUSED(info_ptr) 2967b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 2968893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2969b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Regardless of the error handling below the cached data (if any) can be 2970b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * freed now. Notice that the data is not freed if there is a png_error, but 2971b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * it will be freed by destroy_read_struct. 2972b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2973b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->unknown_chunk.data != NULL) 2974b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_free(png_ptr, png_ptr->unknown_chunk.data); 2975b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->unknown_chunk.data = NULL; 2976893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2977b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else /* !PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ 2978b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* There is no support to read an unknown chunk, so just skip it. */ 2979b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, length); 2980b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_UNUSED(info_ptr) 2981b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_UNUSED(keep) 2982b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* !PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ 2983b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2984b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Check for unhandled critical chunks */ 2985b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (!handled && PNG_CHUNK_CRITICAL(png_ptr->chunk_name)) 2986b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "unhandled critical chunk"); 2987893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 2988893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2989893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* This function is called to verify that a chunk name is valid. 2990b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * This function can't have the "critical chunk check" incorporated 2991b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * into it, since in the future we will need to be able to call user 2992b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * functions to handle unknown critical chunks after we check that 2993b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the chunk name itself is valid. 2994b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 2995893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 2996b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Bit hacking: the test for an invalid byte in the 4 byte chunk name is: 2997b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 2998b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) 2999b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3000893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3001893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 3002b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_check_chunk_name(png_structrp png_ptr, png_uint_32 chunk_name) 3003893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 3004b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int i; 3005b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 30064215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_check_chunk_name"); 3007b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3008b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (i=1; i<=4; ++i) 3009893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3010b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int c = chunk_name & 0xff; 3011b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3012b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (c < 65 || c > 122 || (c > 90 && c < 97)) 3013b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, "invalid chunk type"); 3014b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3015b50c217251b086440efcdb273c22f86a06c80cbaChris Craik chunk_name >>= 8; 3016893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3017893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 3018893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3019b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Combines the row recently read in with the existing pixels in the row. This 3020b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * routine takes care of alpha and transparency if requested. This routine also 3021b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * handles the two methods of progressive display of interlaced images, 3022b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * depending on the 'display' value; if 'display' is true then the whole row 3023b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * (dp) is filled from the start by replicating the available pixels. If 3024b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 'display' is false only those pixels present in the pass are filled in. 3025b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3026893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 3027b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_combine_row(png_const_structrp png_ptr, png_bytep dp, int display) 3028893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 3029b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int pixel_depth = png_ptr->transformed_pixel_depth; 3030b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep sp = png_ptr->row_buf + 1; 303136c9013994bb24ed9f9648dce5a03c07c449420dHenrik Smiding png_alloc_size_t row_width = png_ptr->width; 3032b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int pass = png_ptr->pass; 3033b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep end_ptr = 0; 3034b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_byte end_byte = 0; 3035b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int end_mask; 3036b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 30374215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_combine_row"); 3038b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3039b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Added in 1.5.6: it should not be possible to enter this routine until at 3040b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * least one row has been read from the PNG data and transformed. 3041b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3042b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (pixel_depth == 0) 3043b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, "internal row logic error"); 3044b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3045b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Added in 1.5.4: the pixel depth should match the information returned by 3046b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * any call to png_read_update_info at this point. Do not continue if we got 3047b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this wrong. 3048b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3049b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->info_rowbytes != 0 && png_ptr->info_rowbytes != 3050b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_ROWBYTES(pixel_depth, row_width)) 3051b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, "internal row size calculation error"); 3052b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3053b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Don't expect this to ever happen: */ 3054b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (row_width == 0) 3055b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, "internal row width error"); 3056b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3057b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Preserve the last byte in cases where only part of it will be overwritten, 3058b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the multiply below may overflow, we don't care because ANSI-C guarantees 3059b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * we get the low bits. 3060b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3061b50c217251b086440efcdb273c22f86a06c80cbaChris Craik end_mask = (pixel_depth * row_width) & 7; 3062b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (end_mask != 0) 3063b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3064b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* end_ptr == NULL is a flag to say do nothing */ 3065b50c217251b086440efcdb273c22f86a06c80cbaChris Craik end_ptr = dp + PNG_ROWBYTES(pixel_depth, row_width) - 1; 3066b50c217251b086440efcdb273c22f86a06c80cbaChris Craik end_byte = *end_ptr; 3067b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_READ_PACKSWAP_SUPPORTED 3068b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->transformations & PNG_PACKSWAP) /* little-endian byte */ 3069b50c217251b086440efcdb273c22f86a06c80cbaChris Craik end_mask = 0xff << end_mask; 3070b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3071b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* big-endian byte */ 3072b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 3073b50c217251b086440efcdb273c22f86a06c80cbaChris Craik end_mask = 0xff >> end_mask; 3074b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* end_mask is now the bits to *keep* from the destination row */ 3075b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3076b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3077b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* For non-interlaced images this reduces to a memcpy(). A memcpy() 3078b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * will also happen if interlacing isn't supported or if the application 3079b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * does not call png_set_interlace_handling(). In the latter cases the 3080b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * caller just gets a sequence of the unexpanded rows from each interlace 3081b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * pass. 3082b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3083b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_INTERLACING_SUPPORTED 3084b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE) && 3085b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pass < 6 && (display == 0 || 3086b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The following copies everything for 'display' on passes 0, 2 and 4. */ 3087b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (display == 1 && (pass & 1) != 0))) 3088893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3089b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Narrow images may have no bits in a pass; the caller should handle 3090b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this, but this test is cheap: 3091b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3092b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (row_width <= PNG_PASS_START_COL(pass)) 3093b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 3094b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3095b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (pixel_depth < 8) 3096893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3097b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* For pixel depths up to 4 bpp the 8-pixel mask can be expanded to fit 3098b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * into 32 bits, then a single loop over the bytes using the four byte 3099b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * values in the 32-bit mask can be used. For the 'display' option the 3100b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * expanded mask may also not require any masking within a byte. To 3101b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * make this work the PACKSWAP option must be taken into account - it 3102b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * simply requires the pixels to be reversed in each byte. 3103b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 3104b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The 'regular' case requires a mask for each of the first 6 passes, 3105b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the 'display' case does a copy for the even passes in the range 3106b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 0..6. This has already been handled in the test above. 3107b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 3108b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The masks are arranged as four bytes with the first byte to use in 3109b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the lowest bits (little-endian) regardless of the order (PACKSWAP or 3110b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * not) of the pixels in each byte. 3111b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 3112b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * NOTE: the whole of this logic depends on the caller of this function 3113b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * only calling it on rows appropriate to the pass. This function only 3114b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * understands the 'x' logic; the 'y' logic is handled by the caller. 3115b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 3116b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The following defines allow generation of compile time constant bit 3117b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * masks for each pixel depth and each possibility of swapped or not 3118b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * swapped bytes. Pass 'p' is in the range 0..6; 'x', a pixel index, 3119b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is in the range 0..7; and the result is 1 if the pixel is to be 3120b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * copied in the pass, 0 if not. 'S' is for the sparkle method, 'B' 3121b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * for the block method. 3122b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 3123b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * With some compilers a compile time expression of the general form: 3124b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 3125b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * (shift >= 32) ? (a >> (shift-32)) : (b >> shift) 3126b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 3127b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Produces warnings with values of 'shift' in the range 33 to 63 3128b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * because the right hand side of the ?: expression is evaluated by 3129b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the compiler even though it isn't used. Microsoft Visual C (various 3130b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * versions) and the Intel C compiler are known to do this. To avoid 3131b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this the following macros are used in 1.5.6. This is a temporary 3132b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * solution to avoid destabilizing the code during the release process. 3133b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3134b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if PNG_USE_COMPILE_TIME_MASKS 3135b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_LSR(x,s) ((x)>>((s) & 0x1f)) 3136b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_LSL(x,s) ((x)<<((s) & 0x1f)) 3137b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 3138b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_LSR(x,s) ((x)>>(s)) 3139b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_LSL(x,s) ((x)<<(s)) 3140b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 3141b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define S_COPY(p,x) (((p)<4 ? PNG_LSR(0x80088822,(3-(p))*8+(7-(x))) :\ 3142b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_LSR(0xaa55ff00,(7-(p))*8+(7-(x)))) & 1) 3143b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define B_COPY(p,x) (((p)<4 ? PNG_LSR(0xff0fff33,(3-(p))*8+(7-(x))) :\ 3144b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_LSR(0xff55ff00,(7-(p))*8+(7-(x)))) & 1) 3145b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3146b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Return a mask for pass 'p' pixel 'x' at depth 'd'. The mask is 3147b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * little endian - the first pixel is at bit 0 - however the extra 3148b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * parameter 's' can be set to cause the mask position to be swapped 3149b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * within each byte, to match the PNG format. This is done by XOR of 3150b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the shift with 7, 6 or 4 for bit depths 1, 2 and 4. 3151b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3152b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PIXEL_MASK(p,x,d,s) \ 3153b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (PNG_LSL(((PNG_LSL(1U,(d)))-1),(((x)*(d))^((s)?8-(d):0)))) 3154b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3155b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Hence generate the appropriate 'block' or 'sparkle' pixel copy mask. 3156b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3157b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define S_MASKx(p,x,d,s) (S_COPY(p,x)?PIXEL_MASK(p,x,d,s):0) 3158b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define B_MASKx(p,x,d,s) (B_COPY(p,x)?PIXEL_MASK(p,x,d,s):0) 3159b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3160b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Combine 8 of these to get the full mask. For the 1-bpp and 2-bpp 3161b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * cases the result needs replicating, for the 4-bpp case the above 3162b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * generates a full 32 bits. 3163b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3164b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define MASK_EXPAND(m,d) ((m)*((d)==1?0x01010101:((d)==2?0x00010001:1))) 3165b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3166b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define S_MASK(p,d,s) MASK_EXPAND(S_MASKx(p,0,d,s) + S_MASKx(p,1,d,s) +\ 3167b50c217251b086440efcdb273c22f86a06c80cbaChris Craik S_MASKx(p,2,d,s) + S_MASKx(p,3,d,s) + S_MASKx(p,4,d,s) +\ 3168b50c217251b086440efcdb273c22f86a06c80cbaChris Craik S_MASKx(p,5,d,s) + S_MASKx(p,6,d,s) + S_MASKx(p,7,d,s), d) 3169b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3170b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define B_MASK(p,d,s) MASK_EXPAND(B_MASKx(p,0,d,s) + B_MASKx(p,1,d,s) +\ 3171b50c217251b086440efcdb273c22f86a06c80cbaChris Craik B_MASKx(p,2,d,s) + B_MASKx(p,3,d,s) + B_MASKx(p,4,d,s) +\ 3172b50c217251b086440efcdb273c22f86a06c80cbaChris Craik B_MASKx(p,5,d,s) + B_MASKx(p,6,d,s) + B_MASKx(p,7,d,s), d) 3173b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3174b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if PNG_USE_COMPILE_TIME_MASKS 3175b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Utility macros to construct all the masks for a depth/swap 3176b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * combination. The 's' parameter says whether the format is PNG 3177b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * (big endian bytes) or not. Only the three odd-numbered passes are 3178b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * required for the display/block algorithm. 3179b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3180b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define S_MASKS(d,s) { S_MASK(0,d,s), S_MASK(1,d,s), S_MASK(2,d,s),\ 3181b50c217251b086440efcdb273c22f86a06c80cbaChris Craik S_MASK(3,d,s), S_MASK(4,d,s), S_MASK(5,d,s) } 3182b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3183b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define B_MASKS(d,s) { B_MASK(1,d,s), S_MASK(3,d,s), S_MASK(5,d,s) } 3184b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3185b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define DEPTH_INDEX(d) ((d)==1?0:((d)==2?1:2)) 3186b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3187b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Hence the pre-compiled masks indexed by PACKSWAP (or not), depth and 3188b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * then pass: 3189b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3190b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST png_uint_32 row_mask[2/*PACKSWAP*/][3/*depth*/][6] = 3191893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3192b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Little-endian byte masks for PACKSWAP */ 3193b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { S_MASKS(1,0), S_MASKS(2,0), S_MASKS(4,0) }, 3194b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Normal (big-endian byte) masks - PNG format */ 3195b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { S_MASKS(1,1), S_MASKS(2,1), S_MASKS(4,1) } 3196b50c217251b086440efcdb273c22f86a06c80cbaChris Craik }; 3197b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3198b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* display_mask has only three entries for the odd passes, so index by 3199b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * pass>>1. 3200b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3201b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST png_uint_32 display_mask[2][3][3] = 3202b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3203b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Little-endian byte masks for PACKSWAP */ 3204b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { B_MASKS(1,0), B_MASKS(2,0), B_MASKS(4,0) }, 3205b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Normal (big-endian byte) masks - PNG format */ 3206b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { B_MASKS(1,1), B_MASKS(2,1), B_MASKS(4,1) } 3207b50c217251b086440efcdb273c22f86a06c80cbaChris Craik }; 3208b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3209b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define MASK(pass,depth,display,png)\ 3210b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((display)?display_mask[png][DEPTH_INDEX(depth)][pass>>1]:\ 3211b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_mask[png][DEPTH_INDEX(depth)][pass]) 3212b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3213b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else /* !PNG_USE_COMPILE_TIME_MASKS */ 3214b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is the runtime alternative: it seems unlikely that this will 3215b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * ever be either smaller or faster than the compile time approach. 3216b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3217b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define MASK(pass,depth,display,png)\ 3218b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((display)?B_MASK(pass,depth,png):S_MASK(pass,depth,png)) 3219b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* !PNG_USE_COMPILE_TIME_MASKS */ 3220b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3221b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Use the appropriate mask to copy the required bits. In some cases 3222b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the byte mask will be 0 or 0xff, optimize these cases. row_width is 3223b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the number of pixels, but the code copies bytes, so it is necessary 3224b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * to special case the end. 3225b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3226b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 pixels_per_byte = 8 / pixel_depth; 3227b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 mask; 3228b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3229b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_READ_PACKSWAP_SUPPORTED 3230893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->transformations & PNG_PACKSWAP) 3231b50c217251b086440efcdb273c22f86a06c80cbaChris Craik mask = MASK(pass, pixel_depth, display, 0); 3232b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3233893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 3234b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 3235b50c217251b086440efcdb273c22f86a06c80cbaChris Craik mask = MASK(pass, pixel_depth, display, 1); 3236b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3237b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (;;) 3238b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3239b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 m; 3240b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3241b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* It doesn't matter in the following if png_uint_32 has more than 3242b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 32 bits because the high bits always match those in m<<24; it is, 3243b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * however, essential to use OR here, not +, because of this. 3244b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3245b50c217251b086440efcdb273c22f86a06c80cbaChris Craik m = mask; 3246b50c217251b086440efcdb273c22f86a06c80cbaChris Craik mask = (m >> 8) | (m << 24); /* rotate right to good compilers */ 3247b50c217251b086440efcdb273c22f86a06c80cbaChris Craik m &= 0xff; 3248b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3249b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (m != 0) /* something to copy */ 3250893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3251b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (m != 0xff) 3252b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp = (png_byte)((*dp & ~m) | (*sp & m)); 3253b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 3254b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp = *sp; 3255893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3256893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3257b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* NOTE: this may overwrite the last byte with garbage if the image 3258b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is not an exact number of bytes wide; libpng has always done 3259b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this. 3260b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3261b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (row_width <= pixels_per_byte) 3262b50c217251b086440efcdb273c22f86a06c80cbaChris Craik break; /* May need to restore part of the last byte */ 3263893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3264b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_width -= pixels_per_byte; 3265b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ++dp; 3266b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ++sp; 3267b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3268b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3269893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3270b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* pixel_depth >= 8 */ 3271b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3272b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int bytes_to_copy, bytes_to_jump; 3273893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3274b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Validate the depth - it must be a multiple of 8 */ 3275b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (pixel_depth & 7) 3276b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, "invalid user transform pixel depth"); 3277893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3278b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pixel_depth >>= 3; /* now in bytes */ 3279b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_width *= pixel_depth; 3280b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3281b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Regardless of pass number the Adam 7 interlace always results in a 3282b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * fixed number of pixels to copy then to skip. There may be a 3283b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * different number of pixels to skip at the start though. 3284b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3285893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3286b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int offset = PNG_PASS_START_COL(pass) * pixel_depth; 3287893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3288b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_width -= offset; 3289b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp += offset; 3290b50c217251b086440efcdb273c22f86a06c80cbaChris Craik sp += offset; 3291b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3292b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3293b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Work out the bytes to copy. */ 3294b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (display) 3295b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3296b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* When doing the 'block' algorithm the pixel in the pass gets 3297b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * replicated to adjacent pixels. This is why the even (0,2,4,6) 3298b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * passes are skipped above - the entire expanded row is copied. 3299b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3300b50c217251b086440efcdb273c22f86a06c80cbaChris Craik bytes_to_copy = (1<<((6-pass)>>1)) * pixel_depth; 3301893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3302b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* But don't allow this number to exceed the actual row width. */ 3303b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (bytes_to_copy > row_width) 330436c9013994bb24ed9f9648dce5a03c07c449420dHenrik Smiding bytes_to_copy = (unsigned int)/*SAFE*/row_width; 3305b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3306893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3307b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* normal row; Adam7 only ever gives us one pixel to copy. */ 3308b50c217251b086440efcdb273c22f86a06c80cbaChris Craik bytes_to_copy = pixel_depth; 3309b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3310b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* In Adam7 there is a constant offset between where the pixels go. */ 3311b50c217251b086440efcdb273c22f86a06c80cbaChris Craik bytes_to_jump = PNG_PASS_COL_OFFSET(pass) * pixel_depth; 3312b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3313b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* And simply copy these bytes. Some optimization is possible here, 3314b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * depending on the value of 'bytes_to_copy'. Special case the low 3315b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * byte counts, which we know to be frequent. 3316b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 3317b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Notice that these cases all 'return' rather than 'break' - this 3318b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * avoids an unnecessary test on whether to restore the last byte 3319b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * below. 3320b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3321b50c217251b086440efcdb273c22f86a06c80cbaChris Craik switch (bytes_to_copy) 3322b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3323b50c217251b086440efcdb273c22f86a06c80cbaChris Craik case 1: 3324b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (;;) 3325893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3326b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp = *sp; 3327b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3328b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (row_width <= bytes_to_jump) 3329b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 3330b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3331b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp += bytes_to_jump; 3332b50c217251b086440efcdb273c22f86a06c80cbaChris Craik sp += bytes_to_jump; 3333b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_width -= bytes_to_jump; 3334893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3335893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3336b50c217251b086440efcdb273c22f86a06c80cbaChris Craik case 2: 3337b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* There is a possibility of a partial copy at the end here; this 3338b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * slows the code down somewhat. 3339b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3340b50c217251b086440efcdb273c22f86a06c80cbaChris Craik do 3341893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3342b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp[0] = sp[0], dp[1] = sp[1]; 3343b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3344b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (row_width <= bytes_to_jump) 3345b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 3346b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3347b50c217251b086440efcdb273c22f86a06c80cbaChris Craik sp += bytes_to_jump; 3348b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp += bytes_to_jump; 3349b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_width -= bytes_to_jump; 3350893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3351b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (row_width > 1); 3352893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3353b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* And there can only be one byte left at this point: */ 3354b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp = *sp; 3355b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 3356893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3357b50c217251b086440efcdb273c22f86a06c80cbaChris Craik case 3: 3358b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This can only be the RGB case, so each copy is exactly one 3359b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * pixel and it is not necessary to check for a partial copy. 3360b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3361b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for(;;) 3362893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3363b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp[0] = sp[0], dp[1] = sp[1], dp[2] = sp[2]; 3364b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3365b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (row_width <= bytes_to_jump) 3366b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 3367b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3368b50c217251b086440efcdb273c22f86a06c80cbaChris Craik sp += bytes_to_jump; 3369b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp += bytes_to_jump; 3370b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_width -= bytes_to_jump; 3371893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3372893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3373b50c217251b086440efcdb273c22f86a06c80cbaChris Craik default: 3374b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if PNG_ALIGN_TYPE != PNG_ALIGN_NONE 3375b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Check for double byte alignment and, if possible, use a 3376b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 16-bit copy. Don't attempt this for narrow images - ones that 3377b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * are less than an interlace panel wide. Don't attempt it for 3378b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * wide bytes_to_copy either - use the memcpy there. 3379b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3380b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (bytes_to_copy < 16 /*else use memcpy*/ && 3381b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_isaligned(dp, png_uint_16) && 3382b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_isaligned(sp, png_uint_16) && 3383b50c217251b086440efcdb273c22f86a06c80cbaChris Craik bytes_to_copy % (sizeof (png_uint_16)) == 0 && 3384b50c217251b086440efcdb273c22f86a06c80cbaChris Craik bytes_to_jump % (sizeof (png_uint_16)) == 0) 3385893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3386b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Everything is aligned for png_uint_16 copies, but try for 3387b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * png_uint_32 first. 3388b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3389b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_isaligned(dp, png_uint_32) && 3390b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_isaligned(sp, png_uint_32) && 3391b50c217251b086440efcdb273c22f86a06c80cbaChris Craik bytes_to_copy % (sizeof (png_uint_32)) == 0 && 3392b50c217251b086440efcdb273c22f86a06c80cbaChris Craik bytes_to_jump % (sizeof (png_uint_32)) == 0) 3393b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3394b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32p dp32 = png_aligncast(png_uint_32p,dp); 3395b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_uint_32p sp32 = png_aligncastconst( 3396b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_uint_32p, sp); 3397b50c217251b086440efcdb273c22f86a06c80cbaChris Craik size_t skip = (bytes_to_jump-bytes_to_copy) / 3398b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (sizeof (png_uint_32)); 3399b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3400b50c217251b086440efcdb273c22f86a06c80cbaChris Craik do 3401b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3402b50c217251b086440efcdb273c22f86a06c80cbaChris Craik size_t c = bytes_to_copy; 3403b50c217251b086440efcdb273c22f86a06c80cbaChris Craik do 3404b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3405b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp32++ = *sp32++; 3406b50c217251b086440efcdb273c22f86a06c80cbaChris Craik c -= (sizeof (png_uint_32)); 3407b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3408b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (c > 0); 3409b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3410b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (row_width <= bytes_to_jump) 3411b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 3412b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3413b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp32 += skip; 3414b50c217251b086440efcdb273c22f86a06c80cbaChris Craik sp32 += skip; 3415b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_width -= bytes_to_jump; 3416b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3417b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (bytes_to_copy <= row_width); 3418b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3419b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Get to here when the row_width truncates the final copy. 3420b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * There will be 1-3 bytes left to copy, so don't try the 3421b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 16-bit loop below. 3422b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3423b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp = (png_bytep)dp32; 3424b50c217251b086440efcdb273c22f86a06c80cbaChris Craik sp = (png_const_bytep)sp32; 3425b50c217251b086440efcdb273c22f86a06c80cbaChris Craik do 3426b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp++ = *sp++; 3427b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (--row_width > 0); 3428b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 3429b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3430893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3431b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Else do it in 16-bit quantities, but only if the size is 3432b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * not too large. 3433b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3434b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 3435b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3436b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_16p dp16 = png_aligncast(png_uint_16p, dp); 3437b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_uint_16p sp16 = png_aligncastconst( 3438b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_uint_16p, sp); 3439b50c217251b086440efcdb273c22f86a06c80cbaChris Craik size_t skip = (bytes_to_jump-bytes_to_copy) / 3440b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (sizeof (png_uint_16)); 3441b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3442b50c217251b086440efcdb273c22f86a06c80cbaChris Craik do 3443b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3444b50c217251b086440efcdb273c22f86a06c80cbaChris Craik size_t c = bytes_to_copy; 3445b50c217251b086440efcdb273c22f86a06c80cbaChris Craik do 3446b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3447b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp16++ = *sp16++; 3448b50c217251b086440efcdb273c22f86a06c80cbaChris Craik c -= (sizeof (png_uint_16)); 3449b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3450b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (c > 0); 3451b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3452b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (row_width <= bytes_to_jump) 3453b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 3454b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3455b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp16 += skip; 3456b50c217251b086440efcdb273c22f86a06c80cbaChris Craik sp16 += skip; 3457b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_width -= bytes_to_jump; 3458b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3459b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (bytes_to_copy <= row_width); 3460b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3461b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* End of row - 1 byte left, bytes_to_copy > row_width: */ 3462b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp = (png_bytep)dp16; 3463b50c217251b086440efcdb273c22f86a06c80cbaChris Craik sp = (png_const_bytep)sp16; 3464b50c217251b086440efcdb273c22f86a06c80cbaChris Craik do 3465b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp++ = *sp++; 3466b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (--row_width > 0); 3467b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 3468b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3469b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3470b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNG_ALIGN_ code */ 3471893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3472b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The true default - use a memcpy: */ 3473b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (;;) 3474893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3475b50c217251b086440efcdb273c22f86a06c80cbaChris Craik memcpy(dp, sp, bytes_to_copy); 3476893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3477b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (row_width <= bytes_to_jump) 3478b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 3479893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3480b50c217251b086440efcdb273c22f86a06c80cbaChris Craik sp += bytes_to_jump; 3481b50c217251b086440efcdb273c22f86a06c80cbaChris Craik dp += bytes_to_jump; 3482b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_width -= bytes_to_jump; 3483b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (bytes_to_copy > row_width) 348436c9013994bb24ed9f9648dce5a03c07c449420dHenrik Smiding bytes_to_copy = (unsigned int)/*SAFE*/row_width; 3485b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3486893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3487b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3488b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* NOT REACHED*/ 3489b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } /* pixel_depth >= 8 */ 3490b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3491b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Here if pixel_depth < 8 to check 'end_ptr' below. */ 3492893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3493b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 3494b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 3495b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3496b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* If here then the switch above wasn't used so just memcpy the whole row 3497b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * from the temporary row buffer (notice that this overwrites the end of the 3498b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * destination row if it is a partial byte.) 3499b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3500b50c217251b086440efcdb273c22f86a06c80cbaChris Craik memcpy(dp, sp, PNG_ROWBYTES(pixel_depth, row_width)); 3501b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3502b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Restore the overwritten bits from the last byte if necessary. */ 3503b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (end_ptr != NULL) 3504b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *end_ptr = (png_byte)((end_byte & end_mask) | (*end_ptr & ~end_mask)); 3505893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 3506893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3507893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef PNG_READ_INTERLACING_SUPPORTED 3508893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 3509b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_do_read_interlace(png_row_infop row_info, png_bytep row, int pass, 3510b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 transformations /* Because these may affect the byte layout */) 3511893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 3512a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ 3513a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Offset to next interlace block */ 3514b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; 3515893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 35164215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_do_read_interlace"); 3517893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (row != NULL && row_info != NULL) 3518893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3519893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 final_width; 3520893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3521893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project final_width = row_info->width * png_pass_inc[pass]; 3522893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3523893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project switch (row_info->pixel_depth) 3524893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3525893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case 1: 3526893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3527893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3); 3528893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_bytep dp = row + (png_size_t)((final_width - 1) >> 3); 3529893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int sshift, dshift; 3530893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int s_start, s_end, s_inc; 3531893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int jstop = png_pass_inc[pass]; 3532893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte v; 3533893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 i; 3534893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int j; 3535893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 35365f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_PACKSWAP_SUPPORTED 3537893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (transformations & PNG_PACKSWAP) 3538893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3539893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift = (int)((row_info->width + 7) & 0x07); 3540893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift = (int)((final_width + 7) & 0x07); 3541893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_start = 7; 3542893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_end = 0; 3543893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_inc = -1; 3544893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3545b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3546893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 3547893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 3548893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3549893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift = 7 - (int)((row_info->width + 7) & 0x07); 3550893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift = 7 - (int)((final_width + 7) & 0x07); 3551893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_start = 0; 3552893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_end = 7; 3553893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_inc = 1; 3554893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3555893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3556893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0; i < row_info->width; i++) 3557893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3558893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project v = (png_byte)((*sp >> sshift) & 0x01); 3559893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (j = 0; j < jstop; j++) 3560893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3561b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int tmp = *dp & (0x7f7f >> (7 - dshift)); 3562b50c217251b086440efcdb273c22f86a06c80cbaChris Craik tmp |= v << dshift; 3563b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp = (png_byte)(tmp & 0xff); 3564b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3565893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (dshift == s_end) 3566893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3567893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift = s_start; 3568893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dp--; 3569893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3570b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3571893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 3572893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift += s_inc; 3573893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3574b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3575893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (sshift == s_end) 3576893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3577893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift = s_start; 3578893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sp--; 3579893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3580b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3581893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 3582893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift += s_inc; 3583893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3584893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 3585893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3586b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3587893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case 2: 3588893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3589893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2); 3590893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2); 3591893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int sshift, dshift; 3592893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int s_start, s_end, s_inc; 3593893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int jstop = png_pass_inc[pass]; 3594893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 i; 3595893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 35965f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_PACKSWAP_SUPPORTED 3597893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (transformations & PNG_PACKSWAP) 3598893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3599893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift = (int)(((row_info->width + 3) & 0x03) << 1); 3600893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift = (int)(((final_width + 3) & 0x03) << 1); 3601893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_start = 6; 3602893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_end = 0; 3603893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_inc = -2; 3604893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3605b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3606893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 3607893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 3608893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3609893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1); 3610893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1); 3611893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_start = 0; 3612893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_end = 6; 3613893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_inc = 2; 3614893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3615893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3616893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0; i < row_info->width; i++) 3617893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3618893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte v; 3619893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int j; 3620893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3621893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project v = (png_byte)((*sp >> sshift) & 0x03); 3622893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (j = 0; j < jstop; j++) 3623893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3624b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int tmp = *dp & (0x3f3f >> (6 - dshift)); 3625b50c217251b086440efcdb273c22f86a06c80cbaChris Craik tmp |= v << dshift; 3626b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp = (png_byte)(tmp & 0xff); 3627b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3628893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (dshift == s_end) 3629893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3630893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift = s_start; 3631893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dp--; 3632893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3633b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3634893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 3635893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift += s_inc; 3636893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3637b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3638893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (sshift == s_end) 3639893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3640893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift = s_start; 3641893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sp--; 3642893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3643b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3644893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 3645893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift += s_inc; 3646893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3647893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 3648893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3649b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3650893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case 4: 3651893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3652893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1); 3653893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_bytep dp = row + (png_size_t)((final_width - 1) >> 1); 3654893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int sshift, dshift; 3655893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int s_start, s_end, s_inc; 3656893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 i; 3657893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int jstop = png_pass_inc[pass]; 3658893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 36595f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_PACKSWAP_SUPPORTED 3660893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (transformations & PNG_PACKSWAP) 3661893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3662893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift = (int)(((row_info->width + 1) & 0x01) << 2); 3663893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift = (int)(((final_width + 1) & 0x01) << 2); 3664893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_start = 4; 3665893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_end = 0; 3666893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_inc = -4; 3667893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3668b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3669893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 3670893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 3671893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3672893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2); 3673893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2); 3674893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_start = 0; 3675893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_end = 4; 3676893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project s_inc = 4; 3677893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3678893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3679893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0; i < row_info->width; i++) 3680893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3681b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_byte v = (png_byte)((*sp >> sshift) & 0x0f); 3682893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int j; 3683893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3684893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (j = 0; j < jstop; j++) 3685893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3686b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int tmp = *dp & (0xf0f >> (4 - dshift)); 3687b50c217251b086440efcdb273c22f86a06c80cbaChris Craik tmp |= v << dshift; 3688b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *dp = (png_byte)(tmp & 0xff); 3689b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3690893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (dshift == s_end) 3691893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3692893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift = s_start; 3693893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dp--; 3694893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3695b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3696893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 3697893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dshift += s_inc; 3698893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3699b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3700893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (sshift == s_end) 3701893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3702893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift = s_start; 3703893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sp--; 3704893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3705b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3706893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 3707893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sshift += s_inc; 3708893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3709893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 3710893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3711b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3712893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project default: 3713893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3714893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_size_t pixel_bytes = (row_info->pixel_depth >> 3); 3715b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 37165f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_bytep sp = row + (png_size_t)(row_info->width - 1) 37175f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott * pixel_bytes; 3718b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3719893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes; 3720893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3721893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int jstop = png_pass_inc[pass]; 3722893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 i; 3723893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3724893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0; i < row_info->width; i++) 3725893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3726b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_byte v[8]; /* SAFE; pixel_depth does not exceed 64 */ 3727893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int j; 3728893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3729b50c217251b086440efcdb273c22f86a06c80cbaChris Craik memcpy(v, sp, pixel_bytes); 3730b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3731893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (j = 0; j < jstop; j++) 3732893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3733b50c217251b086440efcdb273c22f86a06c80cbaChris Craik memcpy(dp, v, pixel_bytes); 3734893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dp -= pixel_bytes; 3735893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3736b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3737893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project sp -= pixel_bytes; 3738893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3739893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 3740893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3741893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 3742b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3743893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project row_info->width = final_width; 37444215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width); 3745893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 37465f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifndef PNG_READ_PACKSWAP_SUPPORTED 3747b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_UNUSED(transformations) /* Silence compiler warning */ 3748893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 3749893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 3750893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif /* PNG_READ_INTERLACING_SUPPORTED */ 3751893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3752b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic void 3753b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_filter_row_sub(png_row_infop row_info, png_bytep row, 3754b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep prev_row) 3755b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 3756b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t i; 3757b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t istop = row_info->rowbytes; 3758b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int bpp = (row_info->pixel_depth + 7) >> 3; 3759b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep rp = row + bpp; 3760b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3761b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_UNUSED(prev_row) 3762b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3763b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (i = bpp; i < istop; i++) 3764b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3765b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff); 3766b50c217251b086440efcdb273c22f86a06c80cbaChris Craik rp++; 3767b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3768b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 3769b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3770b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic void 3771b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_filter_row_up(png_row_infop row_info, png_bytep row, 3772b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep prev_row) 3773b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 3774b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t i; 3775b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t istop = row_info->rowbytes; 3776b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep rp = row; 3777b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep pp = prev_row; 3778b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3779b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (i = 0; i < istop; i++) 3780b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3781b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff); 3782b50c217251b086440efcdb273c22f86a06c80cbaChris Craik rp++; 3783b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3784b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 3785b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3786b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic void 3787b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_filter_row_avg(png_row_infop row_info, png_bytep row, 3788b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep prev_row) 3789b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 3790b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t i; 3791b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep rp = row; 3792b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep pp = prev_row; 3793b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int bpp = (row_info->pixel_depth + 7) >> 3; 3794b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t istop = row_info->rowbytes - bpp; 3795b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3796b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (i = 0; i < bpp; i++) 3797b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3798b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *rp = (png_byte)(((int)(*rp) + 3799b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((int)(*pp++) / 2 )) & 0xff); 3800b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3801b50c217251b086440efcdb273c22f86a06c80cbaChris Craik rp++; 3802b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3803b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3804b50c217251b086440efcdb273c22f86a06c80cbaChris Craik for (i = 0; i < istop; i++) 3805b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3806b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *rp = (png_byte)(((int)(*rp) + 3807b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff); 3808b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3809b50c217251b086440efcdb273c22f86a06c80cbaChris Craik rp++; 3810b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3811b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 3812b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3813b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic void 3814b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_filter_row_paeth_1byte_pixel(png_row_infop row_info, png_bytep row, 3815b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep prev_row) 3816b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 3817b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep rp_end = row + row_info->rowbytes; 3818b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int a, c; 3819b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3820b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* First pixel/byte */ 3821b50c217251b086440efcdb273c22f86a06c80cbaChris Craik c = *prev_row++; 3822b50c217251b086440efcdb273c22f86a06c80cbaChris Craik a = *row + c; 3823b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *row++ = (png_byte)a; 3824b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3825b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Remainder */ 3826b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (row < rp_end) 3827b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3828b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int b, pa, pb, pc, p; 3829b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3830b50c217251b086440efcdb273c22f86a06c80cbaChris Craik a &= 0xff; /* From previous iteration or start */ 3831b50c217251b086440efcdb273c22f86a06c80cbaChris Craik b = *prev_row++; 3832b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3833b50c217251b086440efcdb273c22f86a06c80cbaChris Craik p = b - c; 3834b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pc = a - c; 3835b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3836b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_USE_ABS 3837b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pa = abs(p); 3838b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pb = abs(pc); 3839b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pc = abs(p + pc); 3840b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 3841b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pa = p < 0 ? -p : p; 3842b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pb = pc < 0 ? -pc : pc; 3843b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pc = (p + pc) < 0 ? -(p + pc) : p + pc; 3844b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 3845b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3846b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Find the best predictor, the least of pa, pb, pc favoring the earlier 3847b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * ones in the case of a tie. 3848b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3849b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (pb < pa) pa = pb, a = b; 3850b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (pc < pa) a = c; 3851b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3852b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Calculate the current pixel in a, and move the previous row pixel to c 3853b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * for the next time round the loop 3854b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3855b50c217251b086440efcdb273c22f86a06c80cbaChris Craik c = b; 3856b50c217251b086440efcdb273c22f86a06c80cbaChris Craik a += *row; 3857b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *row++ = (png_byte)a; 3858b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3859b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 3860b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3861b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic void 3862b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row, 3863b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep prev_row) 3864b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 3865b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int bpp = (row_info->pixel_depth + 7) >> 3; 3866b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep rp_end = row + bpp; 3867b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3868b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Process the first pixel in the row completely (this is the same as 'up' 3869b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * because there is only one candidate predictor for the first row). 3870b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3871b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (row < rp_end) 3872b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3873b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int a = *row + *prev_row++; 3874b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *row++ = (png_byte)a; 3875b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3876b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3877b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Remainder */ 3878b50c217251b086440efcdb273c22f86a06c80cbaChris Craik rp_end += row_info->rowbytes - bpp; 3879b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3880b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (row < rp_end) 3881b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 3882b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int a, b, c, pa, pb, pc, p; 3883b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3884b50c217251b086440efcdb273c22f86a06c80cbaChris Craik c = *(prev_row - bpp); 3885b50c217251b086440efcdb273c22f86a06c80cbaChris Craik a = *(row - bpp); 3886b50c217251b086440efcdb273c22f86a06c80cbaChris Craik b = *prev_row++; 3887b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3888b50c217251b086440efcdb273c22f86a06c80cbaChris Craik p = b - c; 3889b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pc = a - c; 3890b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3891b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_USE_ABS 3892b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pa = abs(p); 3893b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pb = abs(pc); 3894b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pc = abs(p + pc); 3895b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 3896b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pa = p < 0 ? -p : p; 3897b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pb = pc < 0 ? -pc : pc; 3898b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pc = (p + pc) < 0 ? -(p + pc) : p + pc; 3899b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 3900b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3901b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (pb < pa) pa = pb, a = b; 3902b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (pc < pa) a = c; 3903b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3904b50c217251b086440efcdb273c22f86a06c80cbaChris Craik a += *row; 3905b50c217251b086440efcdb273c22f86a06c80cbaChris Craik *row++ = (png_byte)a; 3906b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 3907b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 3908b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3909b50c217251b086440efcdb273c22f86a06c80cbaChris Craikstatic void 3910b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_init_filter_functions(png_structrp pp) 3911b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari /* This function is called once for every PNG image (except for PNG images 3912b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * that only use PNG_FILTER_VALUE_NONE for all rows) to set the 3913b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * implementations required to reverse the filtering of PNG rows. Reversing 3914b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the filter is the first transformation performed on the row data. It is 3915b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * performed in place, therefore an implementation can be selected based on 3916b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the image pixel format. If the implementation depends on image width then 3917b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * take care to ensure that it works correctly if the image is interlaced - 3918b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * interlacing causes the actual row width to vary. 3919b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3920b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 3921b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int bpp = (pp->pixel_depth + 7) >> 3; 3922b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3923b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub; 3924b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up; 3925b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg; 3926b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (bpp == 1) 3927b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = 3928b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_read_filter_row_paeth_1byte_pixel; 3929b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 3930b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = 3931b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_read_filter_row_paeth_multibyte_pixel; 3932b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3933b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_FILTER_OPTIMIZATIONS 3934b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* To use this define PNG_FILTER_OPTIMIZATIONS as the name of a function to 3935b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * call to install hardware optimizations for the above functions; simply 3936b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * replace whatever elements of the pp->read_filter[] array with a hardware 3937b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * specific (or, for that matter, generic) optimization. 3938b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 3939b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * To see an example of this examine what configure.ac does when 3940b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * --enable-arm-neon is specified on the command line. 3941b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3942b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_FILTER_OPTIMIZATIONS(pp, bpp); 3943b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 3944b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 3945b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3946b50c217251b086440efcdb273c22f86a06c80cbaChris Craikvoid /* PRIVATE */ 3947b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_filter_row(png_structrp pp, png_row_infop row_info, png_bytep row, 3948b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep prev_row, int filter) 3949b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 3950b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* OPTIMIZATION: DO NOT MODIFY THIS FUNCTION, instead #define 3951b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNG_FILTER_OPTIMIZATIONS to a function that overrides the generic 3952b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * implementations. See png_init_filter_functions above. 3953b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3954b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (filter > PNG_FILTER_VALUE_NONE && filter < PNG_FILTER_VALUE_LAST) 3955b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari { 3956b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari if (pp->read_filter[0] == NULL) 3957b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari png_init_filter_functions(pp); 3958b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari 3959b50c217251b086440efcdb273c22f86a06c80cbaChris Craik pp->read_filter[filter-1](row_info, row, prev_row); 3960b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari } 3961b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 3962b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3963b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_SEQUENTIAL_READ_SUPPORTED 3964893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 3965b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_IDAT_data(png_structrp png_ptr, png_bytep output, 3966b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t avail_out) 3967893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 3968b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Loop reading IDATs and decompressing the result into output[avail_out] */ 3969b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_out = output; 3970b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_out = 0; /* safety: set below */ 3971b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3972b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (output == NULL) 3973b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_out = 0; 3974b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3975b50c217251b086440efcdb273c22f86a06c80cbaChris Craik do 3976893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3977b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int ret; 3978b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_byte tmpbuf[PNG_INFLATE_BUF_SIZE]; 3979893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3980b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->zstream.avail_in == 0) 3981893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3982b50c217251b086440efcdb273c22f86a06c80cbaChris Craik uInt avail_in; 3983b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer; 3984893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 3985b50c217251b086440efcdb273c22f86a06c80cbaChris Craik while (png_ptr->idat_size == 0) 3986893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 3987b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari#ifdef PNG_INDEX_SUPPORTED 3988b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari if (png_ptr->index) { 3989b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_opt_crc_finish(png_ptr, 0); 3990b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_ptr->index->stream_idat_position = png_ptr->total_data_read; 3991b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari } else 3992b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari#endif 3993b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_finish(png_ptr, 0); 3994b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 3995b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->idat_size = png_read_chunk_header(png_ptr); 3996b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is an error even in the 'check' case because the code just 3997b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * consumed a non-IDAT header. 3998b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 3999b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->chunk_name != png_IDAT) 4000b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, "Not enough image data"); 4001893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4002b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4003b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_in = png_ptr->IDAT_read_size; 4004b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4005b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (avail_in > png_ptr->idat_size) 4006b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_in = (uInt)png_ptr->idat_size; 4007b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4008b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* A PNG with a gradually increasing IDAT size will defeat this attempt 4009b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * to minimize memory usage by causing lots of re-allocs, but 4010b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * realistically doing IDAT_read_size re-allocs is not likely to be a 4011b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * big problem. 4012b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4013b50c217251b086440efcdb273c22f86a06c80cbaChris Craik buffer = png_read_buffer(png_ptr, avail_in, 0/*error*/); 4014b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4015b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_crc_read(png_ptr, buffer, avail_in); 4016b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->idat_size -= avail_in; 4017b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4018b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_in = buffer; 4019b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_in = avail_in; 4020893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4021b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4022b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* And set up the output side. */ 4023b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (output != NULL) /* standard read */ 4024893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4025b50c217251b086440efcdb273c22f86a06c80cbaChris Craik uInt out = ZLIB_IO_MAX; 4026893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4027b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (out > avail_out) 4028b50c217251b086440efcdb273c22f86a06c80cbaChris Craik out = (uInt)avail_out; 4029b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4030b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_out -= out; 4031b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_out = out; 4032893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4033b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4034b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* after last row, checking for end */ 4035893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4036b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_out = tmpbuf; 4037b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_out = (sizeof tmpbuf); 4038b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 4039893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4040b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Use NO_FLUSH; this gives zlib the maximum opportunity to optimize the 4041b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * process. If the LZ stream is truncated the sequential reader will 4042b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * terminally damage the stream, above, by reading the chunk header of the 4043b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * following chunk (it then exits with png_error). 4044b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 4045b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * TODO: deal more elegantly with truncated IDAT lists. 4046b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4047b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ret = inflate(&png_ptr->zstream, Z_NO_FLUSH); 4048893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4049b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Take the unconsumed output back. */ 4050b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (output != NULL) 4051b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_out += png_ptr->zstream.avail_out; 4052893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4053b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* avail_out counts the extra bytes */ 4054b50c217251b086440efcdb273c22f86a06c80cbaChris Craik avail_out += (sizeof tmpbuf) - png_ptr->zstream.avail_out; 4055893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4056b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_out = 0; 4057893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4058b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (ret == Z_STREAM_END) 4059b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4060b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Do this for safety; we won't read any more into this row. */ 4061b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_out = NULL; 4062893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4063b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->mode |= PNG_AFTER_IDAT; 4064b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; 4065893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4066b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->zstream.avail_in > 0 || png_ptr->idat_size > 0) 4067b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "Extra compressed data"); 4068893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 4069893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4070b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4071b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (ret != Z_OK) 4072b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari#ifdef PNG_INDEX_SUPPORTED 4073b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari if (png_ptr->index && png_ptr->row_number != png_ptr->height - 1) 4074b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari#endif 4075b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4076b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_zstream_error(png_ptr, ret); 4077b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4078b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (output != NULL) 4079b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_error(png_ptr, png_ptr->zstream.msg); 4080b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4081b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* checking */ 4082b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4083b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, png_ptr->zstream.msg); 4084b50c217251b086440efcdb273c22f86a06c80cbaChris Craik return; 4085b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 4086b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 4087b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } while (avail_out > 0); 4088b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4089b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (avail_out > 0) 4090b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4091b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The stream ended before the image; this is the same as too few IDATs so 4092b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * should be handled the same way. 4093b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4094b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (output != NULL) 4095b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, "Not enough image data"); 4096b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4097b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else /* the deflate stream contained extra data */ 4098b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_chunk_benign_error(png_ptr, "Too much image data"); 4099893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4100893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 4101893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 41024ce0ee15f268e0161438b4133936cb2826f7fd50Joseph Wenvoid /* PRIVATE */ 4103b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_finish_IDAT(png_structrp png_ptr) 41044ce0ee15f268e0161438b4133936cb2826f7fd50Joseph Wen{ 4105b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* We don't need any more data and the stream should have ended, however the 4106b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * LZ end code may actually not have been processed. In this case we must 4107b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * read it otherwise stray unread IDAT data or, more likely, an IDAT chunk 4108b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * may still remain to be consumed. 4109b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4110b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (!(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)) 4111b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4112b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The NULL causes png_read_IDAT_data to swallow any remaining bytes in 4113b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the compressed stream, but the stream may be damaged too, so even after 4114b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this call we may need to terminate the zstream ownership. 4115b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4116b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_read_IDAT_data(png_ptr, NULL, 0); 4117b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_out = NULL; /* safety */ 41184ce0ee15f268e0161438b4133936cb2826f7fd50Joseph Wen 4119b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Now clear everything out for safety; the following may not have been 4120b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * done. 4121b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4122b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (!(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)) 4123b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4124b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->mode |= PNG_AFTER_IDAT; 4125b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; 4126b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 4127b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 41284ce0ee15f268e0161438b4133936cb2826f7fd50Joseph Wen 4129b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* If the zstream has not been released do it now *and* terminate the reading 4130b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * of the final IDAT chunk. 4131b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4132b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->zowner == png_IDAT) 4133b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4134b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Always do this; the pointers otherwise point into the read buffer. */ 4135b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.next_in = NULL; 4136b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zstream.avail_in = 0; 41374ce0ee15f268e0161438b4133936cb2826f7fd50Joseph Wen 4138b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Now we no longer own the zstream. */ 4139b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->zowner = 0; 41404ce0ee15f268e0161438b4133936cb2826f7fd50Joseph Wen 4141b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The slightly weird semantics of the sequential IDAT reading is that we 4142b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * are always in or at the end of an IDAT chunk, so we always need to do a 4143b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * crc_finish here. If idat_size is non-zero we also need to read the 4144b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * spurious bytes at the end of the chunk now. 4145b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4146b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (void)png_crc_finish(png_ptr, png_ptr->idat_size); 4147b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 41484ce0ee15f268e0161438b4133936cb2826f7fd50Joseph Wen} 41494ce0ee15f268e0161438b4133936cb2826f7fd50Joseph Wen 4150b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari#ifdef PNG_INDEX_SUPPORTED 4151b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurarivoid /* PRIVATE */ 4152b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripuraripng_set_interlaced_pass(png_structp png_ptr, int pass) 4153b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari{ 4154b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ 4155b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari /* Start of interlace block */ 4156b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; 4157b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari /* Offset to next interlace block */ 4158b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; 4159b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari /* Start of interlace block in the y direction */ 4160b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; 4161b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari /* Offset to next interlace block in the y direction */ 4162b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; 4163b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_ptr->pass = pass; 4164b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_ptr->iwidth = (png_ptr->width + 4165b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_pass_inc[png_ptr->pass] - 1 - 4166b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_pass_start[png_ptr->pass]) / 4167b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_pass_inc[png_ptr->pass]; 4168b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari} 4169b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari#endif 4170b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari 4171893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 4172b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_finish_row(png_structrp png_ptr) 4173893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 4174893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef PNG_READ_INTERLACING_SUPPORTED 4175a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ 4176893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4177a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Start of interlace block */ 4178b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; 4179893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4180a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Offset to next interlace block */ 4181b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; 4182893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4183a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Start of interlace block in the y direction */ 4184b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; 4185893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4186a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Offset to next interlace block in the y direction */ 4187b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; 4188893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif /* PNG_READ_INTERLACING_SUPPORTED */ 4189893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 41904215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_read_finish_row"); 4191893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->row_number++; 4192893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->row_number < png_ptr->num_rows) 4193893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 4194893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4195893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef PNG_READ_INTERLACING_SUPPORTED 4196893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->interlaced) 4197893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4198893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->row_number = 0; 4199b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4200b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* TO DO: don't do this if prev_row isn't needed (requires 4201b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * read-ahead of the next row's filter byte. 4202b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4203b50c217251b086440efcdb273c22f86a06c80cbaChris Craik memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); 4204b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4205893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project do 4206893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4207893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->pass++; 4208b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4209893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->pass >= 7) 4210893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 4211b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4212893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->iwidth = (png_ptr->width + 4213893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_pass_inc[png_ptr->pass] - 1 - 4214893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_pass_start[png_ptr->pass]) / 4215893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_pass_inc[png_ptr->pass]; 4216893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4217893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->transformations & PNG_INTERLACE)) 4218893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4219893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->num_rows = (png_ptr->height + 4220b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_pass_yinc[png_ptr->pass] - 1 - 4221b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_pass_ystart[png_ptr->pass]) / 4222b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_pass_yinc[png_ptr->pass]; 4223893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4224b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4225893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else /* if (png_ptr->transformations & PNG_INTERLACE) */ 4226b50c217251b086440efcdb273c22f86a06c80cbaChris Craik break; /* libpng deinterlacing sees every row */ 4227b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4228b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } while (png_ptr->num_rows == 0 || png_ptr->iwidth == 0); 4229893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4230893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->pass < 7) 4231893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return; 4232893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4233893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif /* PNG_READ_INTERLACING_SUPPORTED */ 4234893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4235b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Here after at the end of the last row of the last pass. */ 4236b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_read_finish_IDAT(png_ptr); 4237893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 42385f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ 4239893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4240893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid /* PRIVATE */ 4241b50c217251b086440efcdb273c22f86a06c80cbaChris Craikpng_read_start_row(png_structrp png_ptr) 4242893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 4243893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef PNG_READ_INTERLACING_SUPPORTED 4244a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ 4245893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4246a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Start of interlace block */ 4247b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; 4248893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4249a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Offset to next interlace block */ 4250b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; 4251893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4252a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Start of interlace block in the y direction */ 4253b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; 4254893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4255a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Offset to next interlace block in the y direction */ 4256b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; 4257893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 4258893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4259893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int max_pixel_depth; 42604215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_size_t row_bytes; 4261893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 42624215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_debug(1, "in png_read_start_row"); 4263b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4264b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_TRANSFORMS_SUPPORTED 4265893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_init_read_transformations(png_ptr); 4266b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 4267893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef PNG_READ_INTERLACING_SUPPORTED 4268893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->interlaced) 4269893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4270893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!(png_ptr->transformations & PNG_INTERLACE)) 4271893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - 4272b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_pass_ystart[0]) / png_pass_yinc[0]; 4273b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4274893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 4275893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->num_rows = png_ptr->height; 4276893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4277893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->iwidth = (png_ptr->width + 4278b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_pass_inc[png_ptr->pass] - 1 - 4279b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_pass_start[png_ptr->pass]) / 4280b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_pass_inc[png_ptr->pass]; 4281893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4282b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4283893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 4284893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif /* PNG_READ_INTERLACING_SUPPORTED */ 4285893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4286893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->num_rows = png_ptr->height; 4287893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->iwidth = png_ptr->width; 4288893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4289b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4290893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = png_ptr->pixel_depth; 4291893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4292b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* WARNING: * png_read_transform_info (pngrtran.c) performs a simpliar set of 4293b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * calculations to calculate the final pixel depth, then 4294b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * png_do_read_transforms actually does the transforms. This means that the 4295b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * code which effectively calculates this value is actually repeated in three 4296b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * separate places. They must all match. Innocent changes to the order of 4297b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * transformations can and will break libpng in a way that causes memory 4298b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * overwrites. 4299b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 4300b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * TODO: fix this. 4301b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 43025f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_PACK_SUPPORTED 4303893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((png_ptr->transformations & PNG_PACK) && png_ptr->bit_depth < 8) 4304893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 8; 4305893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 4306893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 43075f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_EXPAND_SUPPORTED 4308893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->transformations & PNG_EXPAND) 4309893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4310893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 4311893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4312893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->num_trans) 4313893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 32; 4314b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4315893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 4316893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 24; 4317893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4318b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4319893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) 4320893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4321893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (max_pixel_depth < 8) 4322893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 8; 4323b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4324893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->num_trans) 4325893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth *= 2; 4326893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4327b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4328893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) 4329893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4330893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->num_trans) 4331893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4332893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth *= 4; 4333893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth /= 3; 4334893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4335893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4336893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4337893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 4338893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4339b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_EXPAND_16_SUPPORTED 4340b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->transformations & PNG_EXPAND_16) 4341b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4342b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_READ_EXPAND_SUPPORTED 4343b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* In fact it is an error if it isn't supported, but checking is 4344b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the safe way. 4345b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4346b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->transformations & PNG_EXPAND) 4347b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4348b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->bit_depth < 16) 4349b50c217251b086440efcdb273c22f86a06c80cbaChris Craik max_pixel_depth *= 2; 4350b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 4351b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 4352b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 4353b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->transformations &= ~PNG_EXPAND_16; 4354b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 4355b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 4356b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 43575f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_FILLER_SUPPORTED 4358893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->transformations & (PNG_FILLER)) 4359893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4360b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) 4361893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4362893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (max_pixel_depth <= 8) 4363893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 16; 4364b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4365893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 4366893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 32; 4367893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4368b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4369b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB || 4370b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 4371893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4372893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (max_pixel_depth <= 32) 4373893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 32; 4374b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4375893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 4376893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 64; 4377893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4378893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4379893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 4380893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 43815f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 4382893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_ptr->transformations & PNG_GRAY_TO_RGB) 4383893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4384893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ( 43855f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_EXPAND_SUPPORTED 4386b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) || 4387893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 43885f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott#ifdef PNG_READ_FILLER_SUPPORTED 4389b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_ptr->transformations & (PNG_FILLER)) || 4390893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 4391b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 4392893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4393893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (max_pixel_depth <= 16) 4394893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 32; 4395b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4396893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 4397893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 64; 4398893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4399b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4400893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 4401893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4402893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (max_pixel_depth <= 8) 4403b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4404b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 4405893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 32; 4406b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4407b50c217251b086440efcdb273c22f86a06c80cbaChris Craik else 4408893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 24; 4409b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 4410b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4411893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 4412893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 64; 4413b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4414893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 4415893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project max_pixel_depth = 48; 4416893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4417893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4418893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 4419893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4420893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \ 4421893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectdefined(PNG_USER_TRANSFORM_PTR_SUPPORTED) 44224215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project if (png_ptr->transformations & PNG_USER_TRANSFORM) 4423b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4424b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int user_pixel_depth = png_ptr->user_transform_depth * 4425893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->user_transform_channels; 4426b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4427b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (user_pixel_depth > max_pixel_depth) 4428b50c217251b086440efcdb273c22f86a06c80cbaChris Craik max_pixel_depth = user_pixel_depth; 4429b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 4430893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 4431893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4432b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This value is stored in png_struct and double checked in the row read 4433b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * code. 4434b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4435b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->maximum_pixel_depth = (png_byte)max_pixel_depth; 4436b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->transformed_pixel_depth = 0; /* calculated on demand */ 4437b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4438a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Align the width on the next larger 8 pixels. Mainly used 4439a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * for interlacing 4440a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott */ 4441893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7)); 4442a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott /* Calculate the maximum bytes needed, adding a byte and a pixel 4443a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott * for safety's sake 4444a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott */ 44454215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) + 4446b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1 + ((max_pixel_depth + 7) >> 3); 4447b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4448893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef PNG_MAX_MALLOC_64K 4449893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (row_bytes > (png_uint_32)65536L) 4450893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_error(png_ptr, "This image requires a row greater than 64KB"); 4451893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 4452893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4453b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (row_bytes + 48 > png_ptr->old_big_row_buf_size) 4454893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 44554215dd1533c56e1a89ae6f1d6ea68677fac27fdaThe Android Open Source Project png_free(png_ptr, png_ptr->big_row_buf); 4456b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_free(png_ptr, png_ptr->big_prev_row); 4457b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4458a0bb96c34e65378853ee518bac502842d26c2d1aPatrick Scott if (png_ptr->interlaced) 44595f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott png_ptr->big_row_buf = (png_bytep)png_calloc(png_ptr, 4460b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_bytes + 48); 4461b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 44625f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott else 4463b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes + 48); 4464b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4465b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->big_prev_row = (png_bytep)png_malloc(png_ptr, row_bytes + 48); 4466b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4467b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_ALIGNED_MEMORY_SUPPORTED 4468b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Use 16-byte aligned memory for row_buf with at least 16 bytes 4469b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * of padding before and after row_buf; treat prev_row similarly. 4470b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * NOTE: the alignment is to the start of the pixels, one beyond the start 4471b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * of the buffer, because of the filter byte. Prior to libpng 1.5.6 this 4472b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * was incorrect; the filter byte was aligned, which had the exact 4473b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * opposite effect of that intended. 4474b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4475b50c217251b086440efcdb273c22f86a06c80cbaChris Craik { 4476b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep temp = png_ptr->big_row_buf + 32; 4477b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int extra = (int)((temp - (png_bytep)0) & 0x0f); 4478b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->row_buf = temp - extra - 1/*filter byte*/; 4479b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4480b50c217251b086440efcdb273c22f86a06c80cbaChris Craik temp = png_ptr->big_prev_row + 32; 4481b50c217251b086440efcdb273c22f86a06c80cbaChris Craik extra = (int)((temp - (png_bytep)0) & 0x0f); 4482b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->prev_row = temp - extra - 1/*filter byte*/; 4483b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 44845f6bd84e375226bf228fc8ac90318957ec9e1e7fPatrick Scott 4485b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 4486b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Use 31 bytes of padding before and 17 bytes after row_buf. */ 4487b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->row_buf = png_ptr->big_row_buf + 31; 4488b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->prev_row = png_ptr->big_prev_row + 31; 4489b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 4490b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->old_big_row_buf_size = row_bytes + 48; 4491893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 4492893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4493893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef PNG_MAX_MALLOC_64K 4494b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->rowbytes > 65535) 4495893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_error(png_ptr, "This image requires a row greater than 64KB"); 4496b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4497893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 4498b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->rowbytes > (PNG_SIZE_MAX - 1)) 4499b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, "Row has too many bytes to allocate in memory"); 4500893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4501b50c217251b086440efcdb273c22f86a06c80cbaChris Craik memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); 4502b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4503b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_debug1(3, "width = %u,", png_ptr->width); 4504b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_debug1(3, "height = %u,", png_ptr->height); 4505b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_debug1(3, "iwidth = %u,", png_ptr->iwidth); 4506b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_debug1(3, "num_rows = %u,", png_ptr->num_rows); 4507b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_debug1(3, "rowbytes = %lu,", (unsigned long)png_ptr->rowbytes); 4508b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_debug1(3, "irowbytes = %lu", 4509b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (unsigned long)PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1); 4510b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 4511b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The sequential reader needs a buffer for IDAT, but the progressive reader 4512b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * does not, so free the read buffer now regardless; the sequential reader 4513b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * reallocates it on demand. 4514b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4515b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_ptr->read_buffer) 4516893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 4517b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer = png_ptr->read_buffer; 4518893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4519b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer_size = 0; 4520b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_ptr->read_buffer = NULL; 4521b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_free(png_ptr, buffer); 4522b50c217251b086440efcdb273c22f86a06c80cbaChris Craik } 4523893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4524b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Finally claim the zstream for the inflate of the IDAT data, use the bits 4525b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * value from the stream (note that this will result in a fatal error if the 4526b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * IDAT stream has a bogus deflate header window_bits value, but this should 4527b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * not be happening any longer!) 4528b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 4529b50c217251b086440efcdb273c22f86a06c80cbaChris Craik if (png_inflate_claim(png_ptr, png_IDAT) != Z_OK) 4530b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error(png_ptr, png_ptr->zstream.msg); 4531893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 4532893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr->flags |= PNG_FLAG_ROW_INIT; 4533893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 4534893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif /* PNG_READ_SUPPORTED */ 4535